A review of autobiographical memory studies on patients with ......* Correspondence:...
Transcript of A review of autobiographical memory studies on patients with ......* Correspondence:...
RESEARCH ARTICLE Open Access
A review of autobiographical memorystudies on patients with schizophreniaspectrum disordersYujia Zhang1†, Sara K. Kuhn2†, Laura Jobson3† and Shamsul Haque1*†
Abstract
Background: Patients suffering from schizophrenia spectrum disorders demonstrate various cognitive deficiencies,the most pertinent one being impairment in autobiographical memory. This paper reviews quantitative researchinvestigating deficits in the content, and characteristics, of autobiographical memories in individuals withschizophrenia. It also examines if the method used to activate autobiographical memories influenced the resultsand which theoretical accounts were proposed to explain the defective recall of autobiographical memories inpatients with schizophrenia.
Methods: PsycINFO, Web of Science, and PubMed databases were searched for articles published between January1998 and December 2018. Fifty-seven studies met the inclusion criteria. All studies implemented the generativeretrieval strategy by inducing memories through cue words or pictures, the life-stage method, or open-endedretrieval method. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) Statementguidelines were followed for this review.
Results: Most studies reported that patients with schizophrenia retrieve less specific autobiographical memorieswhen compared to a healthy control group, while only three studies indicated that both groups performedsimilarly on memory specificity. Patients with schizophrenia also exhibited earlier reminiscence bumps than thosefor healthy controls. The relationship between comorbid depression and autobiographical memory specificityappeared to be independent because patients’ memory specificity improved through intervention, but their level ofdepression remained unchanged. The U-shaped retrieval pattern for memory specificity was not consistent. Boththe connection between the history of attempted suicide and autobiographical memory specificity, and therelationship between psychotic symptoms and autobiographical memory specificity, remain inconclusive. Patients’memory specificity and coherence improved through cognitive training.
Conclusions: The overgeneral recall of autobiographical memory by patients with schizophrenia could beattributed to working memory, the disturbing concept of self, and the cuing method implemented. The earlierreminiscence bump for patients with schizophrenia may be explained by the premature closure of the identityformation process due to the emergence of psychotic symptoms during early adulthood. Protocol developed forthis review was registered in PROSPERO (registration no: CRD42017062643).
Keywords: Schizophrenia, Autobiographical memory, Cuing methods, Self-memory system, CaR-FA-X model
© The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, andreproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link tothe Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
* Correspondence: [email protected]†Yujia Zhang, Sara K. Kuhn, Laura Jobson and Shamsul Haque contributedequally to this work.1Department of Psychology, Jeffrey Cheah School of Medicine and HealthSciences, Monash University Malaysia, Jalan Lagoon Selatan, 47500 BandarSunway, Selangor Darul Ehsan, MalaysiaFull list of author information is available at the end of the article
Zhang et al. BMC Psychiatry (2019) 19:361 https://doi.org/10.1186/s12888-019-2346-6
BackgroundSchizophrenia spectrum disorders (hereinafter referred toas schizophrenia) are chronic mental disorders with alifetime prevalence rate of about 1% of the populationworldwide [1, 2]. The symptoms of these disorders typic-ally emerge between the mid-teens to mid-30s, with thedisease onset in males being slightly earlier than in fe-males [1, 3]. Patients with schizophrenia demonstratesignificant cognitive deficiency, which is considered tobe the primary reason for impairments in social func-tioning [4, 5]. Cognitive deficits in the domains of auto-biographical memory (AM), working memory,processing speed, and cognitive control are prevalent[6–9]. Impairments in social cognition and theory ofmind (ToM) are also widely reported [10, 11]. The aimof this paper is to review research examining one corecognitive deficit in patients with schizophrenia: deficitsin AM. Specifically, we aimed to review the research thatinvestigated: (a) deficits in AM content and structure;(b) how insight, depression, and history of attemptedsuicide affected the memory of patients with schizophre-nia; and (c) theoretical accounts that were attributed tothe defective recall of AMs among these patients. Stud-ies in this area implement different cuing techniques;thus, a secondary aim was to consider whether AMmethodology influenced results.We are interested in the AMs of patients with schizo-
phrenia because deficits in this type of cognition signifi-cantly impair an individual’s self-identity, ability to learnfrom experiences, and social communication. The mostrecent systematic review on AM in patients with schizo-phrenia summarised findings concerning the compo-nents of AM among patients with schizophrenia, andother mental disorders, in the case where AM has beenstudied [12]. This comprehensive review included 78full-text articles selected from PubMed and PsycINFOand published since the inception of those databasesthrough July 2015. The results illustrated that AMcomponents such as form, content, awareness at re-trieval, and lifespan distribution were impaired in pa-tients with schizophrenia compared to normalcontrols. The reviewers concluded that defective AMis a major cognitive impairment in people sufferingfrom schizophrenia [13].The current systematic review focuses on similar re-
search questions, but also considers three additional andimportant aspects. First, it has re-examined various the-oretical frameworks proposed to explain defective AMsin patients with schizophrenia, including the Self-memory System [14]. Second, as 14 new articles on thesame topic have appeared in the literature since the pub-lication of the last review, we included them in thecurrent review to give an up-to-date overview of thesefindings. We also included an additional 15 articles
published before the last review that were not previouslyconsidered by the reviewers. Third, since the previousreview examined the intervention programmes used toimprove patients’ AMs and found contradictory evi-dence, we aimed to offer an in-depth analysis of whysome interventions worked and why some failed to pro-duce any positive outcomes.In this systematic review, features of AM in patients
with schizophrenia were considered through the lens ofthe Self Memory System (SMS) [14] and the CaR-FA-Xmodel [15]. According to SMS [14, 16], the retrieval ofAM is guided by complex interactions among an indi-vidual’s working self, conceptual self, and the autobio-graphical knowledge base. The term “working self” inSMS refers to “a .complex set of active goals and associ-ated self-images” [17]. The conceptual self, however,contains the socially constructed schema and categoriesthat define the self, other people, and an individual’s typ-ical interaction with the environment. It is learnedthrough socialisation, schooling, and religious practices.The SMS model postulates that recall of AM requiresactivation by cues to access participants’ autobiograph-ical knowledge base. Participants elaborate upon thegiven cue (often presented in the form of cue words)through mental imagery, which is then used to accessthe autobiographical knowledge base comprising lifetimeperiod knowledge, general event knowledge, and event-specific episodic memory. Lifetime period knowledge re-fers to the general knowledge of significant others, com-mon locations, actions, activities, goals, and plans thatare characteristic of that period (e.g., when I was atboarding school) [14]. Lifetime period knowledge oftenrepresents thematic information in memory description,which can overlap with other thematic knowledge. Gen-eral event knowledge is more specific. A general eventrepresents a set of related events and contains differentpieces of memories that can be grouped into the sametheme (e.g., I went to Penang with my friends, and wedrove on the highway along the seaside and ate a lot offood that night). The key feature of episodic memory isvividness, in which people form mental imagery of theirpast experiences. Vividness encompasses the sensory-perceptual details of an event, including sounds, smells,movements and emotions [14].AM specificity depends on the goals of working self.
The idea of “self-discrepancy,” coined by Higgins [18], isoften used to interpret this process. A large self-discrepancy—which is the discrepancy found among theactual self, ideal self, and ought self—normally causes anegative feedback loop, while a small discrepancy resultsin a positive feedback loop [14]. These feedback loopshave a direct effect on an individual’s current goals, in-tentions, or motives, which either inhibit or facilitate theeffort to access the autobiographical knowledge base. If
Zhang et al. BMC Psychiatry (2019) 19:361 Page 2 of 36
a positive feedback loop is formed, AM specificity ishigher; in a negative feedback loop, specificity is re-duced. A person’s ability to recall detailed past experi-ences indicates a high integration between goals and theworking self [14]. Therefore, the less integrated the goalsand working self, the less likely one is to access eventspecific knowledge; thus, more general (or lifetimeperiod) knowledge is retrieved. According to Conwayand Pleydell-Pearce [14], when there is an incongruitybetween the goals of working self and the autobio-graphical knowledge base, the SMS breaks down interms of its normal functionality. If the SMS remainsnonfunctioning, and the disagreement between thesetwo components unresolved, symptoms of confabula-tion, disjunctions, or schizophrenic delusions mayoccur [14, 17].Overgeneral AM is common among patients suffering
from various mental disorders such as anxiety [15], de-pression [19], and post-traumatic stress disorder (PTSD)[20]. Deficiencies in social problem solving and feelingsof increased hopelessness are associated with overgen-eral AM [21]. Three hypotheses have been proposed toexplain this phenomenon, collectively known as theCaR-FA-X model, and consisting of: the capture and ru-mination (CaR) hypothesis, functional avoidance (FA)hypothesis, and impaired executive control (X) hypoth-esis [15]. According to the capture and rumination hy-pothesis, people suffering from anxiety, PTSD, ordepression, show a tendency to dwell upon events andthoughts which may monopolise working memory cap-acity, limiting the cognitive resources required to con-struct specific AMs [15]. Patients tend to ruminateabout things that concern them. In a cued recall para-digm, they map the cues onto their current concerns ra-ther than elaborate the cues adequately to initiate asearch for a specific AM [22]. This mapping of cues andpersonal concerns results in the retrieval of abstract,self-related knowledge rather than specific AMs [23].According to the functional avoidance hypothesis, pa-
tients retrieve overgeneral AMs to avoid negative affectlinked to their traumatic life experiences [24]. The re-trieval of detailed AMs, especially the traumatic ones,leads to distress among patients. Overgeneral AMs arenegatively reinforced to protect them from excess suffer-ing [25]. Lastly, the impaired executive control hypoth-esis suggests that construction of an AM requires thecentral executive of working memory to initiate andmaintain the search within the autobiographical know-ledge base [14]. Any kind of interference with thisprocess—either by distracting attention or overloadingworking memory—would lead to early search termin-ation and thus, overgeneral AMs [19].A recent meta-analysis [13] conducted on 20 studies,
which included 571 patients with schizophrenia and 503
comparison participants, revealed that patients hadlower levels of AM specificity, provided less detailedmemories, and reported less conscious recollection thanhealthy controls. A large-to-medium effect size was re-ported for those three AM parameters. The meta-analysis also examined different methods being used toinduce AMs in the patient population and whether thosemethods influenced the findings. No evidence was foundto suggest it did. Several theoretical explanations wereprovided for why patients with schizophrenia were lesslikely to construct specific AMs (i.e., AMs that are lessspecific in meaning, recall time, people involved, and lo-cation or setting), including difficulty retrieving eventsthat occurred in less than 1 day. First, the authors of themeta-analysis—in line with the CaR-FA-X model—pro-posed that dysfunctional executive functions, due to pre-frontal cortex dysfunctions at both structural andmolecular levels, are responsible for the patients not be-ing able to construct AMs with enough detail.Secondly, patients’ impaired ability to encode AM de-
tails results in the retrieval of less specific AMs. Due toexecutive dysfunction, the patients face difficulty linkingand organising details of the memory for future recall; aphenomenon known as defective strategic encoding [26].These relational memory impairments described inschizophrenia [27, 28] point to defective functioning ofthe hippocampus [29]. A significant positive correlationwas observed between left hippocampal volume and thenumber of AM details recalled [30], suggesting that al-teration of the hippocampus may contribute to AM im-pairment observed in patients. However, it is quitedifficult to examine the relationship between defectivestrategic encoding and AM specificity as personal lifeevents normally take place several years before the AMtest. In addition, the events occurring before onset of thedisease—likely to be the beginning of the defective stra-tegic encoding—also suffer from less detailed recollec-tion. Thirdly, patients with schizophrenia often havetraumatic histories and employ emotional regulationprocesses, such as cognitive avoidance, which may pre-vent them from recalling AMs with enough detail. Nor-mally functioning people, [31–33] as well as people withhigh stress levels, [34] were also found to use these sameemotional regulation processes.The results summarised above from this published
meta-analysis [13] are updated and expanded upon inthe current review. For example, we have reexaminedthe types of memory activation methods being used inpublished studies. We aim to also address a range ofother issues related to patients’ AM. First, although themeta-analysis examined if different cueing methods in-duced AMs with varying specificity, we have reassessedthis aspect as several new studies have been publishedsince the 2016 meta-analysis. Second, we were curious
Zhang et al. BMC Psychiatry (2019) 19:361 Page 3 of 36
to know whether patients’ current level of insight, co-morbid depression, and history of attempted suicide in-fluenced their memory recollection. Third, we relookedat the distribution of patients’ AMs across the lifespan.Although this aspect was thoroughly reviewed by Ricarteand colleagues [12], we aim to discover if their resultswould be altered due to the recent publication of severalnew studies. Fourth, the theoretical accounts highlightedin the meta-analysis received limited support, so we havethoroughly examined the interpretations offered by vari-ous authors and summarised them. Finally, we examinedliterature reporting the effects of various interventionprogrammes on the improvement of patients’ memoryspecificity.
MethodProtocol developed for this review was registered inPROSPERO, an international prospective register forsystematic reviews (registration no: CRD42017062643),and was executed according to the Preferred ReportingItems for Systematic Reviews and Meta-Analyses(PRISMA) Statement and flow diagram [35] (see Fig. 1).The researchers searched PsycINFO, Web of Science,
and PubMed databases for articles published betweenJanuary 1998 and December 2018. Search terms were:“autobiographical memory”, “episodic memory”, “lifestory”, or “narrative”; and “schizophrenia”, “schizophre-nia spectrum disorders”, “psychosis”, or “delusions”.
Inclusion criteria were that studies must be quantitative,and: (a) published in an English language journal from1998 to December 2018; (b) report on autobiographicalmemory (AM) data accumulated from patients withschizophrenia according to the Diagnostic and StatisticalManual of Mental Disorders (DSM-III, DSM-IV, andDSM V), or the International Classification of Diseases(ICD-9, or ICD-10) criteria; (c) compare AM perform-ance among patients with schizophrenia, and also tohealthy controls; and (d) report on at least one measureof features, content, or specificity of AM.The first and last authors of this paper assessed article
quality using 14 criteria developed by Kmet and col-leagues [36], including: research objective, design,method, participant, measures, sample size, data analysis,results, and conclusion (see Appendix A). They assessedand scored each paper independently and assigned art-icle scores from 0 to 2 reflecting the degree to which thespecific criteria were met or reported on (i.e., yes = 2,partial = 1, no = 0). Items not applicable to a given cri-teria were marked N/A and excluded from the final cal-culation. Discrepancies between the two reviewers wereresolved through discussion.
ResultsLiterature searchThe initial database literature search for the current re-view produced 3340 titles, of which 759 from Ovid
Fig. 1 PRISMA-chart
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MEDLINE, 1240 from PsycINFO, 1338 from Web of sci-ence, and 3 from other sources. After screening the ti-tles, 485 articles were retained as the duplicates wereremoved. A total of 352 articles were further removedfrom this list after screening the abstracts, keeping only133 articles for full-text review. The screening of full-text articles excluded another 76 articles. The remaining57 articles were finally included in the current systematicreview, and their data were extracted (see Table 1).We present results in four sections reflecting the four
main themes extracted from the literature: (1) methodsto activate AM; (2) features of AM retrieved by patientswith schizophrenia; (3) enhancing memory specificityand coherence; and (4) theoretical accounts employed tointerpret the results.
Autobiographical memory activation methodsThere were three activation/retrieval methods imple-mented in the reviewed studies: cue word/picturemethods, life stages methods, and open-ended methods(see Table 2).
Cue word/picture methodSeventeen studies used cue words or pictures to evokeautobiographical memories (AMs) from patients withschizophrenia (see Table 2). Cues included pictures orpositive and negative emotion words (e.g., the wordshappy and joyful were used as positive cues; the wordsinsecure and lazy as negative cues). The cue word/pic-ture methods implemented in 12 studies were adaptedfrom Williams and Broadbent [90]. The form (e.g., pre-sented verbally or on cards) and number of cues in thereviewed studies varied. Several studies presented twocue sets (positive and negative) [38, 42, 43, 47, 54, 67,72, 83], while others used three sets (positive, negative,and neutral) or defeat-related cues [52, 60, 63, 68, 80].Sets of cue words employed varied. For example,McLeod and Wood [47] used happy, proud, relieved,pleased, excited, and hopeful as positive cue words, whileTaylor and Gooding [60] used the words tender, excited,friendly, peaceful, and pleasant. Picture cues were alsoused [51], including 120 pictures (i.e., positive, negative,and neutral images) from the International Affective Pic-ture System to stimulate participants’ emotions to evokespecific memories [91]. One study [65] used cue-within-the-cue words adapted from an earlier study [105]. Afterthe patients retrieved a specific AM for each cue word,they were asked to title the memory; this title was usedto evoke another memory in a subsequent trial [65].One study [77] applied the Narrative of Emotion Task,asking participants to construct their experiences basedon simple (i.e., happy; sad), complex (i.e., surprised; sus-picious), and self-conscious (i.e., ashamed; guilty) emo-tion words. Another study [55] used the Schedule for
Deficit Syndrome [94] to prompt AMs through the useof emotion words (e.g., happiness, enjoyment, sadness,upset, and irritation).
Life stages methodThe life stages method was found in 15 studies. TheAutobiographical Memory Interview (AMI) [95],employed in five studies (see Table 2), was the secondmost often used assessment. In AMI, participants areasked to recall three events in great detail from each lifestage: childhood, early adulthood, and recent life. TheAutobiographical Memory Enquiry (ABME) [97], themost frequently used measure, appears in six studies(see Table 2) to induce patients’ AM in four life stages:(a) childhood to age 9, (b) ages 10 to 19, (c) age 20 to 1year before the test, and (d) the current year. The Auto-biographical Memory Inquiry [96]—quite similar toABME—appears in two studies (see Table 2), and alsoelicited the recollection of patients’ AMs in four lifestages. The sole difference between these two measureslies in the representation of the second and third stages.The Autobiographical Memory Inquiry’s second stage isfrom age 11 to the age of symptom onset, and the thirdstage is from the age of onset to 1 year before the test[96]. Two studies (see Table 2) employed the German E-AGI (Erweitertes Autobiographisches Gedächtnisinter-view) [98] to elicit AM recollection. It prompts memor-ies for five life stages: preschool, primary school,secondary school, early adulthood (i.e., until the age of35), and the most recent 5 years. One recent study [87]employed the Questionnaire of Autobiographical Mem-ory (QAM), including two scales measuring semanticand episodic AM recalled from three different lifeperiods.
Open-ended retrieval methodIn 26 studies (see Table 2), open-ended retrievalmethods encouraged participants to freely recall lifeevents without providing more than necessary precondi-tioned information (e.g., at a certain period of time, or ina certain mood). The two most frequently used open-ended retrieval methods were the protocol from the In-diana Psychiatric Illness Interview (IPII) [104] and themethod to recall self-defining memories (SDMs) [106].While the former method was used in nine studies [45,49, 56, 57, 79, 84, 86], the latter was used in six studies[58, 64, 66, 82, 85]. There were four sessions to completethe IPII. First, participants shared their life stories; nextthey described their psychological conditions, andthirdly, they shared their experience of having these con-ditions. Lastly, participants presented on how their con-ditions affected their lives. The SDMs used in sixstudies, required participants to recall three importantmemories to best define who they are and reflect their
Zhang et al. BMC Psychiatry (2019) 19:361 Page 5 of 36
Table
1Extractio
nTables
forSelected
Stud
ies
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
1Feinsteinet
al.(1998)[37]
USA
Stud
y2:
Patients,n=19
Con
trol,n
=10
•AMI*
1)Whe
nAMs,in
term
sof
specificity,w
ere
distrib
uted
over
thelifespan,patientsexhibited
aU-shape
dcurve,meaning
morespecific
mem
orieswererecalledfro
mchildho
odand
recent
yearscomparedto
early
adulthoo
d.
After
initialfailure
inmem
oryrecallfro
mearly
adulthoo
d,somecompe
nsationmay
occur,
allowingforbe
tter
recallfro
mlaterpe
riods,as
wellasa“sup
er-recen
t”effect.A
lso,childho
odmem
oryfro
mtheprem
orbidpe
riodwas
better
encode
dor
moreresistantto
disrup
tion.
0.818
2)Con
trols,ho
wever,sho
wed
arelatively
flatdistrib
ution.
2Kane
yet
al.(1999)[38]
UK
Patients,n=20
Peop
lewith
depression
only,n
=20
Con
trol,n
=20
Samples
werematched
inageandge
nder.
•AMT*
1)Patientsge
neratedless
specificAM
topo
sitivecues
than
negativecues.
Repo
rtingof
overge
neralm
emoryisatypical
respon
sewhilerecalling
atraumaticeven
t.Patientsavoiding
giving
specificde
tails
for
theirpasteven
tsmay
bedu
eto
having
prob
lematicrelatio
nships
inearly
life.
0.955
2)Patientswith
delusion
aldisorder
gene
ratedless
specific(ormorecatego
rical)
AM
than
othe
rgrou
ps.
3)Patientswith
depression
gene
ratedmore
catego
ricalAMscomparedto
othe
rgrou
ps.
4)Patientswith
delusion
aldisorder
recalled
AMsslow
erthan
controls.
3Elvevaget
al.(2003)[39]
Maryland
Patients,n=21
Con
trol,n
=21.
Samples
werematched
inageon
ly.
•Freelyrecollect
episod
esfro
mparticipants’lives.
1)Patientsprod
uced
sign
ificantlyfewer
AMs
than
controlp
articipants.
Possibly“a
gene
ralretrievald
eficit”
inthe
patient
grou
p.Patients’pe
rform
ance
deficit
was
dueto
encoding
oracqu
isition
prob
lems
durin
gthemostrecent
timepe
riod.
Theresearchersbe
lievedthat
patientswere
leftto
theirow
nde
vices;they
didno
tusean
efficient
encoding
strategy.
1.0
2)Patientsprod
uced
moreAMsfro
mthe
timepreced
ingillne
sson
setthan
afterillne
sson
set.
4Riutortet
al.(2003)[40]
France
Patients,n=24
Con
trols,n=24
Samples
werematched
insex,age,anded
ucation.
•AME*
1)Patientsshow
edan
impairm
entof
both
compo
nentsof
AM
(i.e.,sem
aticandep
isod
icmem
ories)andaredu
ctionof
levelsof
specificity,com
paredto
controls.
Thedrug
treatm
entmay
have
contrib
uted
tothepatients’retrievalp
atterns,likeanti-
Parkinson’smed
ication.Ano
ther
reason
could
relate
toade
fect
inen
coding
processes,
provided
that
theillne
sswas
alreadypresen
tbe
fore
theon
setof
symptom
s.(i.e.,neurode
velopm
entalh
ypothe
sis).D
efectiveconstructio
nof
person
aliden
titymay
implya
developm
entalissue
inthefro
ntallobe
.SM
Smod
el:abn
ormality
ofpe
rson
aliden
tity,
which
was
associated
with
redu
cedlevelsof
specificity.
0.955
2)Patientsprod
uced
sign
ificantlyless
specificAMsthan
controlssincetheon
setof
symptom
s.
5Corcoranet
al.(2003)
[41]
UK
Patients,n=59
Con
trols,n=44
Samples
werematched
insexandage.
•AMI*
1)Patientspe
rform
edsign
ificantlyworse
than
controlsin
alltasks.
Odd
even
tsin
childho
od,the
repo
rted
reason
forwhich
couldbe
potentialtraum
atic
childho
odeven
ts.
0.909
2)Patientstend
edto
retrieve
moreod
dAMscomparedto
controls.
3)Theod
dor
negativerecollections
amon
gpatientstend
edto
comefro
mchildho
od.
6Harrison
etal.(2004)[42]
UK
Patients,n=38
•AMT*
1)Patientsrecalledmorecatego
ricalAMs
comparedto
extend
edmem
ories.
Notheo
ryor
theo
reticalframew
orkappliedin
explaining
theresults.
1.0
Zhang et al. BMC Psychiatry (2019) 19:361 Page 6 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
How
ever,the
researchersmen
tione
dthat
patientswererecruitedin
different
stages
ofrecovery;the
refore,the
recouldbe
asampling
bias.The
searelim
itatio
nsof
thestud
y,no
tan
explanationforthefinding
s.
2)Patients’de
pressive
levelswere
sign
ificantlycorrelated
with
avoidancerelatin
gto
psycho
sis.
3)Therewas
asign
ificant
negative
correlationbe
tweenne
gativepsycho
ticsymptom
sandretrievalo
fspe
cific
AM
amon
gpatients.
4)Avoidance
oftraumaticmem
ories
relatin
gto
psycho
sisandspecificity
inAM
weresign
ificant
pred
ictorsforne
gative
symptom
s.
7Iqbaletal.(2004)[43]
UK
Post-psychoticde
pressive
patients,n=13
Patients,n=16
Samples
werematch
inseverityof
illne
ss,g
ende
r,ed
ucation,anddu
ratio
nof
symptom
sor
admission
.
•AMT*
1)Patientswith
depressive
symptom
srecalled
morege
neralm
emory,espe
ciallywith
positive
cue-words,thanpatient
with
outde
pressive
symptom
s.
Autho
rsbe
lievedthat
theseverityof
depressive
symptom
swas
associated
with
positiveor
negativemem
ories.Results
were
supp
ortedby
theidea
from
Williamsand
Broadb
ent[15],thatsymptom
she
lped
toavoidprevious
traumaticexpe
riences
(i.e.,
CARFAXMod
el-avoidancemechanism
).
1.0
2)Nosign
ificancewas
observed
betw
een
grou
psregardingspecificmem
oryretrieval.
3)Patientswith
depressive
symptom
sappe
ared
tohave
better
insigh
t(i.e.,awaren
ess
ofillne
ss)comparedwith
patientswith
out
depression
.
8Danionet
al.(2005)[44]
France
Patients,n=21
Con
trols,n=21
Samples
werematched
inageanded
ucation.
•ABM
E*1)
Patientsratedsign
ificantlylower
than
controlsin
remem
berin
gAMs.
Researchersclaimed
that
drug
treatm
entcould
contrib
uteto
thecurren
tresults.M
oreo
ver,
accordingto
theSM
S,therewou
ldbe
ade
fect
inexecutiveprocesses(i.e.,elabo
rative,
strategic,andevaluativeprocesses).
Theresults
reflected
encoding
oracqu
isition
prob
lems.
0.818
2)Patientsratedsign
ificantlymorethan
controlsto
theeven
tsthat
they
wereun
sure.
3)In
term
sof
detailof
AM,p
atientsscored
sign
ificantlylower
comparedto
controls.
9Lysakeret
al.(2005)[45]
France
Outpatients,n=52
•IPII*
(with
NCR
S*)
1)Lack
ofaw
aren
essin
patientswas
sign
ificantlyrelatedto
narrativein
term
sof
detail,tempo
ralcon
ceptualcon
nection,and
plausibility.
Autho
rsdidno
tprovideanytheo
ryto
supp
ort
theresults.H
owever,the
yexplaine
dthat
positivesymptom
swillim
pact
abstract/flexible
thinking
,hen
ceitmay
have
been
associated
with
plausibilityin
thenarrative.Po
orplausibilityin
narrativereflected
low
functio
nin
socializing.
1.0
2)Lack
ofaw
aren
essin
patientswas
not
3)associated
with
positiveor
negative
symptom
s(i.e.,neurocogn
ition
)andqu
ality
oflife.
4)Lack
ofaw
aren
esswas
associated
with
poor
perfo
rmance
inverbalmem
ory.
5)Associatio
nbe
tweenhigh
levelsof
positivesymptom
swith
poorer
tempo
ral
concep
tualconn
ectio
n,andplausibilityin
narratives
was
observed
.
6)Plausibilityin
narrativewas
associated
Zhang et al. BMC Psychiatry (2019) 19:361 Page 7 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
with
quality
oflife(i.e.,socialfun
ction).
10Lysakeret
al.(2005)[46]
Outpatients,n=16
Con
trol
grou
p:-Blindparticipants,n
=8
-MDD,n
=4
•Narrativeinterview
(with
STAND*)
1)Thequ
ality
ofnarrativein
patientswas
sign
ificantlypo
orer
than
controlsin
term
sof
self-worth
(i.e.,experiencingthem
selves
asvaluableto
othe
rs)a
ndagen
cy(i.e.,abilityto
sensethat
they
canaffect
even
tsin
theirow
nlives),indicatin
gthat
patientsconsider
their
pastto
beof
curren
tsocialvalue,have
apassiveconn
ectio
nto
othe
rs,and
believe
that
theirlives
arecontrolledby
outsideforces.
Autho
rsbe
lievedthat
negativesymptom
s(i.e.,
diminishing
affect;volition
)causedthem
tohave
little
emotion;resulting
inthetelling
ofa
thin
storywith
outmuchcontext.
1.0
2)Neg
ativesymptom
sandne
urocog
nitive
impairm
entwerepred
ictorsof
thepo
orqu
ality
ofpatient
narratives.
3)Noeviden
cethat
observed
narrative
disrup
tions
wereassociated
with
levelsof
depression
/anxiety
orpo
sitivesymptom
s.
4)Awaren
essof
illne
sswas
sign
ificantly
associated
with
insigh
tandjudg
emen
t.
11Lysakeret
al.(2005)[45]
Patients,n=6(average
flexibilityin
abstract
thinking
);n=10
(below
average)
•IPII*
(with
NCR
S*)
1)After
a5-mon
thvocatio
nalreh
abilitatio
n,no
sign
ificant
resultwas
observed
innarrative
cohe
renceam
ongpatients.
Autho
rsbe
lievedthat
patientswith
intact
neurocog
nitiveabilitiesmay
beableto
developmorecohe
rent
storiesaftervocatio
nal
rehabilitation,which
provided
patientswith
working
expe
riences
andhe
lped
them
togain
asenseof
iden
tityandde
veloppe
rson
alpo
tential.
0.818
2)How
ever,the
patient
with
average
flexibilityin
abstract
thinking
seem
edto
improvein
narrativecohe
renceafter5-mon
ths
vocatio
nalreh
abilitatio
n.
12McLeo
det
al.(2006)[47]
UK
Patients,n=20
Con
trols,n=20
Samples
werematched
with
age,ed
ucationlevel,
prem
orbidIQ,levelof
depression
,and
gene
ral
mem
oryability.
•AMI*
•AMT*
1)Patientsshow
edaU-shape
dtempo
ral
gradient,asthey
perfo
rmed
sign
ificantlyworse
inearly
adulthoo
dthan
othe
rpe
riods
oftim
e(i.e.,childho
odandrecent),in
term
sof
person
alfacts.
Autho
rsinterpretedthat
patients’AM
retrieval
processwas
abortedprem
aturely,po
ssibly
reflectingage
nerald
eficitof
respon
seinhibitio
n.U-shape
dpattern:patients’disrup
tionof
encoding
andconsolidationprocessarou
ndtheon
setof
illne
ss(i.e.,lateadolescenceand
early
adulthoo
d).
They
speculated
that
patients’en
coding
deficits
may
bepresen
tedfro
mavery
early
ageandthen
they
remainstableeven
arou
ndthetim
eof
onsetof
illne
ss.
SMS:pe
riodof
late
adolescenceandearly
adulthoo
disatim
ewhe
nAM
know
ledg
eis
beingorganisedto
form
acohe
rent
person
aliden
tity.Goalo
ftheselfplaysamajor
rolein
both
theen
coding
andaccessibility
ofAM
intheno
rmalpo
pulatio
n.Disturbingconcep
tof
selfwas
considered
amajor
factor
inde
velopm
entof
psycho
ticsymptom
s.
1.0
2)Patientsrecalledrecent
person
alfacts
better
than
childho
odpe
rson
alfacts.
3)Con
trolsdidno
tshow
anydifferencein
recalling
even
tsfro
mthreepe
riods
oflife.
4)Patientsrecalledmorerecent
even
tsthan
even
tsfro
mchildho
odandearly
adulthoo
d.
5)Patientsprod
uced
sign
ificantlyless
specificandmorecatego
ricalAMs,andmore
‘uninterpretable’respo
nses
than
controls.
6)Amon
gpatients,thehigh
erprop
ortio
nof
specificAMswas
recalledon
theAMT,and
moreAMson
theAMI.
Zhang et al. BMC Psychiatry (2019) 19:361 Page 8 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
7)Patientsrespon
dedmorequ
icklythan
thecontrolsto
both
positiveandne
gativecue
words.
13Bo
eker
etal.(2006)[48]
Germany
Patients,n=22
Con
trols,n=22
Samples
werematched
inage,ge
nder,edu
catio
n,andIQ.
•AMI*(life
perio
ds)
1)U-shape
dretrievalstylewas
observed
.Autho
rsargu
edthat
lack
ofcapacity
inworking
mem
oryandexecutivefunctio
nmay
create
aninability
tomaintainacohe
rent
self.
Nofurthe
rexplanationprovided
regardingthe
AM
inyoun
gadulthoo
d.
1.0
2)Nosign
ificant
differencebe
tween
patientsandcontrolsin
AM
even
tsandfacts
inyouthandrecent
even
ts.
3)Onlysign
ificanceoccurred
durin
gyoun
gadulthoo
d.
4)Correlatio
nwas
notfoun
dam
ong
patientsin
executivefunctio
nsandworking
mem
ories,bu
twas
foun
dforcontrols.
14Lysakeret
al.(2006)[49]
US
Patients,n=64
•IPII*
(with
STAND*)
1)Highe
rlevelo
fnarrativequ
ality
(i.e.,illness
awaren
ess,agen
cy,alienatio
n)was
associated
with
better
socialfunctio
ning
andmotivational
hope
amon
gpatients.
Patients’po
sitivesymptom
smay
makethem
feelthat
they
wereno
tin
controlo
fthe
irlives;
henceasenseof
selfwas
interfe
redwith
.
1.0
2)Po
sitivesymptom
swerelinkedto
lack
ofinsigh
tin
illne
ss,and
aninability
toaffect
even
tsin
theirow
nlives.
3)Neg
ativesymptom
swerealso
linkedto
lack
ofinsigh
tin
illne
ssandlower
senseof
self-worth.
15Cuervo-Lombard
etal.
(2007)
[50]
France
Patients,n=27
Con
trols,n=27
Samples
werematched
inage,ed
ucation,and
gend
er.
•To
recall20
autobiog
raph
icaleven
tsin
asmuchde
tailas
possible.
1)Patients’reminiscencebu
mps
wereearlier
than
forcontrols;p
atients’bu
mps
werefor16
to25
years,whe
reas
controls’b
umps
werefor
21to
25years.
Patients’early
bumps
might
bedu
eto
impairedpe
rson
aliden
tity,which
isa
fund
amen
tald
isturbance
intheirillne
ss.
Defectiveretrievalp
rocesses
may
explainan
overallred
uctio
nin
perfo
rmance
amon
gpatients.Moreo
ver,ade
fectivesenseof
self
may
redu
cetheaccessibility
ofhigh
lyself-
relevant
AMs.Ade
fect
inen
coding
oracqu
isition
processesmay
accoun
tforthe
aggravationof
AM
abno
rmalities
repo
rted
after
theon
setof
thedisease.
SomeAM
abno
rmalities
may
merelybe
caused
bythefact
that
patientshadapo
orer
andmorerestrictedlifethan
norm
alsubjects,
andhe
nce,en
coun
teredfew
mem
orablelife
even
ts.
SMS:Bu
mpabno
rmalities
inpatientsmay
berelatedto
theform
ationof
abno
rmallifego
als.
0.955
2)Patientsratedsign
ificantlylower
inAM
specificity
comparedto
controls.
3)Patientsrespon
dedless
inRemem
ber;
morein
Know
andGuess
toAM
details
(i.e.,
what,whe
re,and
whe
n).
4)Patientsrecalledfewer
AMsrelatedto
births
andde
aths,b
utmorerelatedto
work
anded
ucation,comparedto
controls.
16Neumannet
al.(2007)
[51]
Belgium
Patients,n=20
Con
trols,n=20
Samples
werematch
inage,ge
nder,and
levelo
f
•IAPS*
1)Patientspe
rform
edworse
than
controls.
Patients’respon
sepatterns
couldno
tbe
explaine
dby
drug
treatm
ent,as
therewas
nocorrelationbe
tweenIQ
andmem
ory
perfo
rmance.Rem
embe
rrespon
sesreflected
1.0
2)Patientsrecalledless
AMsthan
controls.
3)Patientsrecalledless
specificAMs,and
Zhang et al. BMC Psychiatry (2019) 19:361 Page 9 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
education.
thelevelo
fconfiden
ce,n
ottherecollected
processes;he
nce,patients’mem
orieswere
weaker.
Deficitin
specificeven
tknow
ledg
ein
patients
couldexplaintheiroverge
neralretrieval
patternoftenassociated
with
asimplefeeling
offamiliarity.
morege
neralm
emoriescomparedto
controls.
4)Patientsrecalledless
negativeAMsthan
controls.
5)Patientsrecalledmorepo
sitivege
neral
mem
ories,whe
reas
controlsrecalledmore
negativespecificAMsandmorene
gative
gene
ralm
emories.
6)Norelatio
nshipwas
observed
betw
een
psycho
sissymptom
sandspecificity
ofAM.
17Warrenet
al.(2007)[52]
UK
Schizoph
renicpatients,
n=12
Peop
lewith
depression
only,n
=12
Con
trols,n=12
•AMI*
•AMT*
1)Schizoph
renicgrou
psscored
high
erin
anxietyandde
pression
than
controls.
2)Clinicalgrou
psge
neratedmore
Overgen
eralmem
oryretrievalissymptom
atic
ofclinicalcond
ition
s(i.e.,d
epression;
schizoph
renia).Itreflectsafund
amen
tal
prob
lem
inmem
oryprocessing
.Theresearchersob
ject
totheview
that
overge
neralityiscaused
bytheavoidanceof
remem
berin
gpe
rson
allyrelevant
even
ts,as
patientsretrievedfewer
publicmem
oriesthan
controls.
Ruminativeself-focus,associated
with
thepain
ofrecalling
specificeven
ts,can
redu
ceworking
mem
orycapacity;hen
ce,b
lock
thesearch
atthelevelo
fcatego
ricalde
scrip
tions.A
lso,
researchersbe
lievedthat
pasttraumamight
play
arolein
thede
velopm
entand
mainten
ance
ofoverge
neralretrievalo
fAM.
0.909
3)catego
ricalAMsthan
controls.
4)Dep
ressed
patientsge
neratedmore
specificAMsthan
patientswith
schizoph
renia.
5)In
term
sof
details
ofAMs,clinicalgrou
psdidno
tdiffer.
6)Con
trolsandde
pressive
patientsrecalled
AMsfaster
comparedto
patientswith
schizoph
renia.
18D’Argem
beau
etal.
(2008)
[53]
France
Patients,n=16
Con
trols,n=16
Allsubjectswerematched
inage,ed
ucation,
prem
orbidIQ,and
levels
ofde
pressive
symptom
s.
•AMT*
1)Patientsrepo
rted
less
specificandmore
catego
ricalrespon
sesthan
controls.
Researchersclaimed
that
deficitin
patients’
AM
was
relatedto
theirability
toretrieve
contextualinform
ationfro
mmem
oryand
positivesymptom
swereassociated
with
deficits
inmem
oryforcontextualinform
ation.
Patients’de
ficits
werein
partrelatedto
disturbanceof
thesenseof
subjectivetim
e,which
represen
tsakeyfeatureof
episod
icmem
ory.
0.773
2)Patientsge
neratedmorespecific
respon
sesforthepastthan
forthefuture.
3)Theprop
ortio
nof
specificrespon
ses
gene
ratedby
patientswerene
gativelyrelated
topo
sitivesymptom
s.
4)Nosign
ificant
correlationwas
foun
dbe
tweenne
gativesymptom
sandthe
prop
ortio
nof
specificrespon
ses.
19Blairy
etal.(2008)[54]
Belgium
Patientswith
AM
interven
tion,n=15
Con
trol
grou
ppatients,
n=12
•AMT*
1)Patientswith
AM
interven
tionappe
ared
torecallmorespecificAM
before
the
interven
tion,andbe
tter
perfo
rmance
comparedwith
controls.
Byapplying
treatm
ent,patients’capacity
for
retrievalw
asim
proved
.Notheo
ryprovided
.How
ever,autho
rsargu
edthat
othe
rthan
toim
provepatients’AM,p
atientsmay
need
toacqu
iresocialskillto
functio
nbe
tter
indaily
life.
0.955
2)Nocorrelationob
served
betw
eenAM
specificity
(beforeandafterinterven
tion)
and
age,ed
ucation,socialfunctio
ning
,illness
duratio
n,po
sitiveandne
gativesymptom
s,cogn
itive
functio
ning
,and
levelo
fde
pression
Zhang et al. BMC Psychiatry (2019) 19:361 Page 10 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
oranxiety.
3)Po
sitivecorrelationob
served
betw
een
AM
specificity
(beforeandafterinterven
tion)
with
executivefunctio
n.
4)Follow
upafter3mon
ths:Patientswith
interven
tionrecalledmorespecificAM
than
before
treatm
ent;ho
wever,nosign
ificant
differencebe
tweenaftertreatm
entand3-
mon
thfollow-up.
20Gruber&
Kring(2008)[55]
US
Stud
y1:
Outpatients,n=34
Inpatients,n=8
Stud
y2:
Outpatients,n=24
Con
trols,n=19
Samples
werematched
inge
nder,age
,edu
catio
n,andmaritalstatus.
Stud
y1
•SD
S*(with
outne
utral
lifeeven
ts)
Stud
y2
•SD
S*(with
neutrallife
even
ts)
1)Stud
y1:Patients’narratives
inne
gative
storieswereless
clear,bu
thadmorede
tail,
than
positiveeven
ts.
Autho
rssugg
estedthat
patientswereableto
talkabou
ttheirpo
sitiveandne
gativelife
stories.How
ever,the
yappe
ared
detached
from
theirem
otionalevent
stories,justlike
controls.
Notheo
riesweremen
tione
d.
1.0
2)Patients’narratives
ofpo
sitiveeven
tsappe
ared
morelikelyto
involveothe
rpe
ople,
comparedwith
negativeeven
ts.
3)Stud
y2:Nosign
ificant
differencein
term
sof
intensity
ofem
otionallife
even
tsbe
tweencontrolsandpatients.
4)Bo
thgrou
psused
emotionwords
inthe
narrativecontextapprop
riately.
5)Less
meaning
clarity
inpo
sitiveand
negativeem
otionnarrativecomparedwith
neutraln
arratives
amon
gbo
thgrou
ps,
sugg
estin
gthat
both
grou
psappe
ared
tobe
detached
.
6)Patientswereas
likelyas
controlsto
tell
theirpastsinvolvingothe
rpe
oplein
asocially
engaging
manne
r
7)Patients’em
otioneven
tnarratives
appe
ared
less
linearthan
controlsin
term
sof
tempo
ralseq
uence.
21Lysakeret
al.(2008)[56]
US
Patientswith
:-Schizop
hren
ia,n
=31
-Schizoaffective,n=20
Samples
werematched
inage,ed
ucation,and
numbe
rof
hospitalisations.
•IPII*
(with
STAND*)
1)Levelo
fmetacog
nitive(i.e.,insight)was
positivelyassociated
with
education;no
twith
ageandhistoryof
hospitalisation.
Autho
rsem
phasised
theim
portance
ofa
biop
sychosocial(i.e.,med
ical,social,and
psycho
logical)approach
fortreatin
gpatients.
1.0
2)Patients’expe
riences
ofbe
ing
3)rejected
wereno
tlinkedto
their
quality
ofnarrative.
4)Patientswho
perfo
rmed
better
inmetacog
nitivetestsandhadless
internalised
stigmatend
edto
narrate
better
quality
oftheirstoriesabou
ttheirillne
ss.
22Ro
eet
al.(2008)[57]
Patients,n=65
•IPII*
(with
SUMD*)
1)Patientswho
denied
symptom
sand
Autho
rsexplaine
dabou
tthecurren
tfinding
0.955
Zhang et al. BMC Psychiatry (2019) 19:361 Page 11 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
US
diagno
sesin
theirstorytelling
appe
ared
tohave
lower
levelsof
awaren
essof
theirillne
ss(i.e.,insight).
that
patientshe
ldarang
eof
beliefsand
attitud
estowards
theirillne
ss,and
thelack
ofinsigh
tmight
beamisinterpretatio
nby
researchers.Furthe
rstud
iesmay
ameliorate
thisconcern.
23Lysakeret
al.(2008)[56]
US
Patients,n=76
•IPII*
(with
NCR
S*)
1)Patientswith
good
insigh
tinto
theirillne
ssin
theirnarrativepe
rform
edbe
tter
regarding
flexibilityof
abstract
thou
ghts;b
etterToM
(i.e.,
ability
toun
derstand
othe
r’sintentions
and
emotions).
Autho
rsargu
edthat
patientswith
schizoph
reniahave
adifferent
levelo
faw
aren
essabou
ttheirow
npsycho
logical
cond
ition
,which
hasan
impact
ontheir
abstract
thou
ghtsandability
toun
derstand
othe
r’sem
otions
andintentions.M
oreo
ver,
theiraw
aren
essof
theircond
ition
contrib
uted
totheirsocialfunctio
ning
.
1.0
2)Patientswith
supe
rficialaw
aren
ess(i.e.,
plausiblelifestorywith
tempo
ralcoh
eren
cy,
butlackingin
detail)werethesameas
patientswith
good
insigh
tin
that
they
perfo
rmed
better
inverbalmem
oryandToM
than
patientswith
poor
insigh
tinto
illne
ss.
3)Patientswith
good
insigh
tor
supe
rficial
awaren
esshadmorefre
quen
tsocialcontact
than
thosewho
hadlow
insigh
t.
24Raffard
etal.(2009)[58]
France
Patientsn=20
Con
trols,n=20
Samples
werematched
inage,ed
ucation,pre-
morbidIQ,and
levelsof
depression
.
•SD
Ms*
1)Nodifferencein
recalling
numbe
rof
specific
self-de
finingmem
oriesbe
tweenpatientsand
controls.
Patientspresen
tsign
ificant
metacog
nitive
deficits.The
lack
ofmeaning
makingplaysa
major
rolein
thecreatio
nandmainten
ance
ofpe
rson
aliden
tity.Hen
ce,few
erself-de
fining
mem
oriesarecentered
onachievem
ent
them
es.
Patients’redu
cedaccess
topastexpe
riences
ofsuccessandincreasedaccess
toep
isod
esrelatedto
theirillne
sscontrib
uted
tomaintaining
ane
gativeview
oftheself.
Bump10–20:concerns
socialiden
tity
form
ation.
Bump:
20–30:concerns
person
aliden
tity
form
ation.Mem
oriesin
thebu
mpareself-
definingas
sugg
estedby
Con
way
andHolm.
1.0
2)Patientsprod
uced
sign
ificantlyfewer
integrated
self-de
finingmem
ories(i.e.,
meaning
making)
than
controls.
3)Patientsprod
uced
sign
ificantlyfewer
words
inde
scrip
tions
ofself-de
fining
mem
oriesthan
controls.
4)Patientsprod
uced
fewer
self-de
fining
mem
oriescharacterised
byachievem
ent
conten
tthan
controls.
5)Patientsprod
uced
substantialamou
ntsof
self-de
finingmem
oriescharacterised
byho
spitalisation/stigmatisationconten
t.
6)Thereminiscencebu
mppe
akfor
controlswas
20–24years;whe
reas
forpatients
itwas
15–19years.
25Meh
letal.(2010)[59]
Germany
Patients,n=55
Con
trols,n=45
Samples
werematched
inage,ge
nder,and
yearsof
education.
•AMI*
1)Patients’ability
toinferem
otions
was
positivelycorrelated
with
ToM.
SMS:de
clarativecogn
itive
tasksactivate
implicitAM,m
eaning
that
theability
torecall
AM
ismorecloselyassociated
with
theability
toinferintentions.
Inferringem
otionisassociated
with
social
perfo
rmance,b
ecause
emotionpe
rcep
tionis
anautomaticprocessthat
requ
iresproced
ural
1.0
2)Patientsweremoreim
pairedin
theToM
ability
toinferem
otions.
3)Patientsrecalledless
specific,less
detailed,
andfewer
numbe
rof
AMscompared
Zhang et al. BMC Psychiatry (2019) 19:361 Page 12 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
know
ledg
ethat
isconstantlyrefined
while
practicingit,in
accordance
with
themod
elof
skillacqu
isition
.
tocontrols.
4)Patients’de
ficits
inAMswereassociated
with
deficits
intheability
toinferintentions.
5)Amon
gpatients,therewas
asign
ificant
associationbe
tweenAM
(AMItotalscore)
and
socialpe
rform
ance
(totalscore).
26Taylor
etal.(2010)[60]
UK
Outpatientswith
history
ofsuicideattempts,n=40
Outpatientswith
out
historyof
suicide
attempts,n=20
•AMT*
1)Patientswith
pastsuicideattemptsrepo
rted
sign
ificantlyhigh
erlevelsof
both
depressive
andanxiou
ssymptom
scomparedto
non-
attempters.
Researchersstated
that
patients’retrievalstyle
blockedaccess
topo
tentially
distressing
specificmem
ories,includ
ingthoseof
traumaticandaversive
expe
riences,asaway
ofself-protectio
n.SM
S:theretrievalstyleistiedup
with
one’s
person
algo
alsandself-iden
tity.Mem
orysys
temsmay
disrup
taccess
tomem
oriesthat
are
particularlyaversive
oreg
o-dyston
ic,sothat
patientsavoiddistressingmem
ories.
1.0
2)Traitsof
anxietyandde
pression
were
sign
ificantlyrelatedto
AM
specificity
amon
gpatients.
3)Suicideattemptersweremorelikelyto
recallspecificAMs.
4)Neg
ativecue-words
weresign
ificantlyas
sociated
with
thehigh
estprop
ortio
nof
dis
tressing
mem
ories.
27Saaved
ra(2010)
[61]
Spain
Shortleng
thof
stay
inpatients,n=9
Long
leng
thof
stay
inpatients,n=9
•Narrativeinterview
1)Patientswith
along
leng
thof
stay
appe
ared
tohave
less
delusion
andlack
ofcohe
sion
intheirlifestoriescomparedto
patientswith
shortleng
thsof
stay.
Patientswith
along
stay
intheho
mesetting,
with
serio
usparano
idschizoph
renia,wereable
tonarratetheirlives.
0.909
2)Long
stay
patientsseem
edto
recallmore
storiesrelatedto
relatio
nships,activities,and
illne
ss.
3)Patientswith
long
leng
thsof
stay
tend
edto
useless
words
inde
scrib
ingne
gativelife
stories.
4)Long
erstay
patientsused
fewer
words
relatin
gto
themetaphysical(i.e.,de
ath;
parano
rmaleven
ts),andhadbe
tter
inne
rorganisatio
nof
narrativecomparedto
patients
with
shorterleng
thsof
stay.
28Pernot-M
arinoet
al.
(2010)
[62]
France
Patients,n=8
Con
trols,n=8
•Diary-recording
1)Num
berof
Know
respon
sesassociated
with
true
andfalsemem
orieswas
high
erin
patients
comparedto
controls.
Therewas
foun
dto
beahigh
erfre
quen
cyof
Know
ingforfalsemem
oriesin
patients
possiblyaccompanied
with
agreater
frequ
ency
ofconsciou
srecollectionforfalse
mem
ories.
Patients’abilitiesto
estim
atetheplausibilityof
even
tswith
respectto
theircurren
tpe
rson
alplanswereim
paired.
0.909
2)Thefre
quen
cyof
Remem
berrespon
ses
was
lower
inpatientsthan
controlsfortrue
even
ts
3)Thefre
quen
cyof
Remem
berrespon
ses
was
high
erin
patientsthan
controlsforfalse
even
ts.
Zhang et al. BMC Psychiatry (2019) 19:361 Page 13 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
29Pettersenet
al.(2010)[63]
Norway
Patientswith
historyof
suicideattempts,n=16
Patientswith
outhistoryof
suicideattempts,n=16
•AMT*
1)Nodifferencebe
tweengrou
psin
curren
tde
pression
andho
pelessne
ss.
Cog
nitivefunctio
ning
couldbe
thereason
sfor
theresults,how
ever,thisstud
ydidn
’tinclud
eanyne
urop
sycholog
icalvariables.
Hop
elessnessoftenprod
uces
overge
neralA
M,
however,itwas
notob
served
inthisstud
y.Autho
rargu
edthat
itcouldbe
dueto
limited
statisticalpo
wer.
0.955
2)Patientswith
historiesof
suicide
attemptsrepo
rted
sign
ificantlyhigh
ercurren
tsuicideideatio
ncomparedto
patientswith
out
historiesof
suicideattempts.
3)Patientswith
historiesof
suicide
attemptsprod
uced
sign
ificantlyfewer
specific
AMs,andmorege
neralm
emories,compared
topatientswith
outhistoriesof
suicide
attempts.
4)Patientswith
historiesof
suicide
attemptsshow
edasign
ificant
increase
innu
mbe
rof
specificAMsforne
gativeand
neutralcue
words.
30Raffard
etal.(2010)[64]
France
Patients,n=81
Con
trols,n=50
Samples
werematched
inage,levelo
fedu
catio
n,andprem
orbidIQ
(i.e.,
NationalA
dultReading
Test,M
ackinn
on&
Williams,1996).
•SD
Ms*
1)Patientsdidno
tdifferfro
mcontrolsin
the
numbe
rof
specificSD
Msrepo
rted
.Theearlier
bumpcouldbe
dueto
anim
pairm
entin
immed
iate
self-aw
aren
essand
thedisturbanceof
thetempo
rald
imen
sion
ofselfthat
assuresastableandcohe
rent
sense
ofiden
tity(the
bumpisacriticalp
eriodfor
theform
ationandmainten
ance
ofastable
senseof
iden
tity).
Life
scrip
tsisasche
maof
norm
ativeeven
tsthat
arecultu
rally
expe
cted
tooccurat
given
times
inthelifespan.How
ever,p
atientsmight
expe
riencedisrup
tionto
thoseexpe
cted
norm
ativeeven
tsdu
ringillne
sson
set,leading
toisolationandsocialwith
draw
al.
1.0
2)Patientsde
mon
stratedless
meaning
-makingthan
controls.
3)Patientsscored
lower
inachievem
ent
andrelatio
nshipconten
tthan
controls.
4)Patientsrecalledmorelife-threaten
ing
even
tsthan
controls.
5)Patientsrecalledless
cohe
rencyin
context,chrono
logy,and
them
ethan
controls.
6)Con
trols’reminiscencebu
mppe
akwas
20to
24years;patientswas
15to
19years.
31Moriseet
al.(2011)[65]
France
Patients,n=18
Con
trol,n
=17
Samples
werematched
inageandlevelo
fed
ucation.
•Chainsof
mem
oriesby
using
ape
rson
almem
oryas
acue
foranothe
rmem
ory.
1)The“chain”levelexplained
6.9%
ofthe
varianceof
emotionalinten
sity
score,and
15.7%
ofdistinctiven
essscorein
controls.
They
believedthat
patients’mem
ory
characteristicshadlosttheirpo
tentiald
riving
forcein
mem
oryorganisatio
n,andthat
emotionalexperienceassociated
with
mem
oriesmight
play
acompe
nsatoryrolein
respectto
thisorganisatio
n.AM
impairedprefrontalactivity
anda
dysfun
ctionalcon
nectivity
betw
eenthe
amygdalaandtheprefrontalcortex.
0.818
2)The“chain”levelexplained
15.1%
ofthe
varianceof
emotionalinten
sity
scores
and
11.8%
ofdistinctiven
essscorein
patients.
3)The“chain”accoun
tedfor26.9%
ofthe
varianceof
data
incontrols,and
36.2%
inpatients.
32Bernaet
al.(2011)[66]
France
Patients,n=24
Con
trols,n=24
Samples
werematched
inageanded
ucation.
•SD
Ms*
1)31%
ofself-de
finingmem
oriesin
patients
wererelatedto
ape
rson
alho
spitalizationand/
orpsycho
ticsymptom
s;2.5%
ofthemem
ories
relatedto
person
alillne
ssam
ongcontrols.
Thepatientswith
morepron
ounced
negative
symptom
sexpe
rienced
severe
impairm
entsin
giving
meaning
totheirself-de
fining
mem
ories.
Life
alterin
geven
tscanhave
aprofou
ndim
pact
onpatients’pe
rcep
tionof
them
selves,
0.909
2)Patients’meaning
makingwas
sign
ificantlylower
comparedto
controls.
Zhang et al. BMC Psychiatry (2019) 19:361 Page 14 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
espe
ciallyin
thecontextof
apsycho
logical
disorder.The
even
tsbe
comealand
markbo
thfortheselfandin
AM;con
sequ
ently,influen
cepe
rson
algo
als.
3)SD
Mwas
negativelycorrelated
with
level
ofne
gativesymptom
sam
ongpatients.
33Bernaet
al.(2011)[66]
France
Patients,n=24
Con
trols,n=24
Samples
werematched
inage,ed
ucation,prem
orbid
IQ,current
IQ,and
self-
esteem
.
•SD
Ms*
1)71%
ofmem
oriesfro
mpatientsrelatedto
psycho
ticep
isod
es;29%
referred
toothe
rpast
even
tshaving
contrib
uted
totheirillne
ss.
Theresearchersbe
lievedthat
theredu
ced
ability
togive
senseto
illne
ss-related
mem
oriesdo
esno
tseem
topreven
tthese
mem
oriesfro
mpo
sitivelyintegratinginto
the
self.
0.909
2)15.6%
ofmem
oriesfro
mcontrolsrelated
tope
rson
alillne
ssand84%
totheillne
ssof
acloserelative.
3)Patientsprod
uced
lower
meaning
makingthan
controls
4)Illne
ss-related
SDMsweremorene
gative
than
othe
rSD
Ms.
5)Patientsdisplayedmoretraumatic
mem
oriesthan
controls.
6)After
splittin
gthepatientsinto
theon
eswith
good
insigh
tandim
pairedinsigh
t,the
results
indicatedno
differencebe
tweenthem
with
respectto
theprop
ortio
nof
even
tsassociated
with
rede
mption.
34Cuervo–Lom
bard
etal.
(2012)
[67]
France
Patients,n=13
Con
trols,n=14
Samples
werematched
inage,ed
ucation,andverbal
abilities(i.e.,IQ).
•AMT*
1)Nosign
ificant
differenceon
thequ
antityof
AMsandspecificity
scores
amon
gtw
ogrou
ps.
Theresearchersstated
that
therewas
ade
creasedactivationof
thecogn
itive
control
netw
orkandaberrant
activationof
thedo
rsal
striatum
amon
gpatients.
0.864
2)Nosign
ificant
differences
inen
coding
age,remoten
ess,andvalencebe
tweengrou
pswhe
nretrieving
mem
ories.
3)Patientsandcontrolsactivated
asimilar
brainne
tworkdu
ringretrieval,includ
ingthe
corticalmidlinestructures,leftlateralp
refro
ntal
cortex,leftangu
largyrus,med
ialtem
poral
lobe
s,occipitallob
e,andcerebe
llum.
4)Patientsdisplayedredu
cedactivationin
severalo
fthe
seregion
scomparedto
controls,
includ
ingtw
ocorticalmidlinestructures,the
leftlateralp
refro
ntalcortex,leftmed
ial
tempo
rallob
e,occipitallob
e,rig
htcerebe
llum,
andleftlateralven
traltegm
entalarea.
35Ricarteet
al.(2012)[68]
Spain
Patients,n=24
(experim
entalg
roup
)Patientswith
Life
Review
therapy,n=26
(active
controlg
roup
).
•ABM
E*1)
Therewas
asign
ificant
negativecorrelation
betw
eenpre-interven
tionBD
Iscoresand
semantic
association(AM).
They
explaine
dgreaterim
pairm
entin
AMs
that
wereparticularlymarkedforeven
tsthat
occurred
aftertheon
setof
thedisease.The
improvem
entof
moo
dwas
perhapsdu
eto
theinterven
tionas
oneof
thesessions
focused
onself-de
finingmem
ories.
0.909
2)Allparticipantsscored
lower
onconsciou
sretrievalfor
theABM
Ein
P3and
P4comparedto
P1andP2.
Zhang et al. BMC Psychiatry (2019) 19:361 Page 15 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
3)Theexpe
rimen
talg
roup
displayed
sign
ificantlyincreasedAM
specificity
afterthe
interven
tion.
4)Dep
ressionde
creasedafterinterven
tion
inexpe
rimen
talg
roup
,but
notin
control
grou
p.
36Po
theegado
oet
al.
(2012)
[69]
France
Patients,n=25
Con
trols,n=25
Samples
werematched
inage,ge
nder,and
levelo
fed
ucation.
•ABM
E*1)
Patients’self-esteem
was
sign
ificantlylower
than
forcontrols.
Patients’pe
rcep
tionof
thesubjectivetempo
ral
distance
(i.e.TD
)ofpasteven
tsisdistorted,
causingthem
toreplymorefre
quen
tlyon
objectiveeviden
cethan
controlsdo
whe
nassessingthetempo
rald
istanceof
thepast.
Thisdisturbanceisparticularlymarkedin
the
lifepe
riodfollowingtheon
setof
schizoph
renia.
Theam
ount
ofde
tailin
patients’AMswas
not
sign
ificantlycorrelated
with
thesubjectiveTD
ofeven
ts.A
utho
rsargu
edthat
thislack
ofde
tail,tempo
ralo
rno
n-tempo
ral,represen
tson
eprob
ableexplanationforthedistorted
subjectivetim
epe
rcep
tionthat
haslong
been
observed
inschizoph
renia.
0.955
2)Patientsprovidesign
ificantlymore
objectiveexplanations
andrespon
seswith
out
explanations.
3)Patientsprod
uced
sign
ificantlyfewer
specificmem
oriesthan
controls.
4)Patientsrecalledsign
ificantlyless
tempo
raland
non-tempo
ralinformationthan
controlsat
P3andP4.
5)Mem
oryim
portance
was
high
erat
P3than
theothe
rpe
riods.
37Benn
ouna
–Green
eet
al.
(2012)
[70]
France
Patients,n=25
Con
trols,n=25
Samples
werematch
inage,levelo
fedu
catio
n,prem
orbidIQ,and
curren
tIQ.
•TheTw
enty
“Iam
…”
Statem
entTask
1)Patientsappe
ared
tohave
sign
ificantly
lower
AM
specificity
andRemem
berrespon
ses
comparedto
controls.
Less
specificandless
consciou
slyrecollected
AMsin
patientsweredu
eto
preserved
tempo
ralo
rganisation(i.e.,life-tim
epe
riod).
Tempo
ralo
rganisationandcharacteristicsof
emotionwas
intact,but
thethem
aticorganisa
tionandits
distinctivefeatures
ofmem
ories
wereno
t.Patientsde
pend
edno
ton
distinctive
characteristicsof
theeven
t,bu
tseem
inglyon
lyon
emotionalinten
sity.
2)Patientshadalower
prop
ortio
nof
active
“Iam
”statem
entsthan
controls.
3)Patientsrecalledsign
ificantlymore
negativeAMs.
4)Patientswereassessed
lower
inthem
atic
linkby
expe
rimen
ters.
5)“Iam
”statem
ents:
✓Explaine
d19.2%
ofthevarianceof
the
emotionalinten
sity
score;28.3%
ofthe
distinctiven
essscores
incontrols.But,13.7%
;11.4%
ofem
otionalinten
sity
and
distinctiven
essscores
inpatients,respectively.
✓Patientson
lyshow
edsign
ificant
correlationbe
tweenem
otionalintensity
and
them
aticlink.
38Heroldet
al.(2013)[30]
Germany
Patients,n=33
Con
trols,n=21
Samples
werematched
inage,ge
nder,and
levelo
fed
ucation.
•AMI*
•E-AGI*
1)In
patients,thevolumes
oftheleftandthe
leftanterio
rhipp
ocam
puswerene
gatively
correlated
with
duratio
nof
illne
ss.
Researchersclaimed
that
long
-term
anti
psycho
ticmed
icationandtheirpo
tential
effectson
brainstructuremustbe
considered
asapo
tentialcon
foun
ding
factor.
Less
frequ
ently
recalledmem
oriesmay
0.864
2)Patientsrepo
rted
sign
ificantlyfewer
episod
icde
tails
than
controls.
Zhang et al. BMC Psychiatry (2019) 19:361 Page 16 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
depe
ndon
hipp
ocam
palfun
ction.
3)Episod
icandsemantic
AM
scores
were
notsign
ificantlycorrelated
with
age,du
ratio
nof
illne
ss.
4)Semantic
AM,b
utno
tep
isod
icAM,w
assign
ificantlycorrelated
with
educationam
ong
patients.
5)Episod
icandsemantic
AM
were
sign
ificantlycorrelated
with
lefthipp
ocam
pal
volumein
patientsforbo
ththeleftanterio
randleftpo
steriorhipp
ocam
pal.
6)Therewas
asign
ificant
correlation
betw
eensemantic
AMsandbo
thleft
hipp
ocam
paland
leftpo
steriorhipp
ocam
pal
volumein
controls.
39Po
theegado
oet
al.
(2013)
[71]
France
Outpatients,n=30
Con
trols,n=30
Samples
werematched
inage,ge
nder,IQ,and
education.
•AMT*
1)Patientsappe
ared
tohave
high
levelsof
depression
,and
lower
self-esteem
compared
tocontrols.
Autho
rsargu
edpatients’low
specificity
may
berelatedto
fewer
respon
sesrelatedto
Field
perspe
ctive,sugg
estin
gthat
less
specificAM
couldno
tallow
thepatientsto
re-experience
theirlifestories.
0.955
2)Specificity
ofAM
inpatientswas
sign
ificantlylower
than
controls.
3)AM
specificity
was
high
erwhe
nrecollectingwas
associated
with
theField
perspe
ctivecomparedto
theObserver
perspe
ctive.
4)Amon
gpatients,no
relatio
nshipwas
observed
amon
glevelsof
anxiety,de
pression
,andself-esteem
,and
scores
intheFieldpe
rspective.How
ever,a
sign
ificant
relatio
nship
was
observed
betw
eenIQ
andtheField
perspe
ctive.
40Ricarteet
al.(2014)[72]
Spain
Patients,n=31
Con
trols,n=31
Samples
werematched
inage,ge
nder,and
yearsof
education.
•AMT*
1)Patientsscored
sign
ificantlyhigh
erin
depression
andruminationthan
controls.
Car-FA-X
mod
elem
ployed
;3functio
nsinvolved
inthedifficulties
toaccess
specific
mem
ories:1)
rumination,2)
functio
nal
avoidance,and3)
executivefunctio
n.In
thisframew
ork,executivefunctio
nis
essentiald
uringtheeffortfulp
rocess
ofge
nerativeretrieval.
AM
impairm
entmay
noton
lyrelate
tode
ficits
occurringat
theretrievalp
hase
inpatients.
Dysfunctio
nsin
cogn
itive
processesinvolved
attheen
coding
phaseor
inthestorageand
organisatio
nph
asemay
also
contrib
uteto
patients’AM
deficits.
0.955
2)Patientsretrievedfewer
specificAMs
than
controls.
3)Nosign
ificant
correlationwas
observed
betw
eenthenu
mbe
rof
specificmem
ories
andanyothe
rfactorsam
ongpatients.
4)Dep
ressionandruminationexplaine
d24%
ofthevarianceof
mem
oryspecificity
incontrols,b
uton
ly2.6%
inpatients.
41Moe
&Doche
rty
(2014)
[73]
Schizoph
renicou
tpatients,
n=50
•Self-de
scrip
tion
1)Qualityof
narrativewas
notassociated
with
levelo
fedu
catio
n.Autho
rssugg
estedthat
deficitin
agen
cyand
relatedn
essto
othe
rswerekeyfactorsam
ong
1.0
Zhang et al. BMC Psychiatry (2019) 19:361 Page 17 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
US
Bipo
larpatients,n=17
Con
trols,n=24
patientswith
schizoph
renia.
2)Sign
ificant
results
wereob
served
betw
eenpatientswith
schizoph
reniaand
controlsin
thequ
ality
ofnarrativein
term
sof
relatedn
ess,levelo
fself-de
finition
,neg
ative-
positiveself-regard,and
self-criticaln
ature,etc.
3)Moreo
ver,sign
ificant
results
happ
ened
betw
eenpatientswith
schizoph
reniaand
bipo
larpatientsin
thequ
ality
ofnarrative(i.e.,
levelo
frelated
ness,levelof
self-de
finition
,and
negative-po
sitiveself-regard).
42Po
theegado
oet
al.
(2014)
[74]
France
Outpatients,n=25
Con
trols,n=25
Samples
werematched
inage,ed
ucation,IQ,and
levelo
fde
pression
.
•AME*
1)Patientspe
rform
edpo
orer
than
controlsin
allcog
nitivemeasures.
Autho
rsconclude
dthat
specificcueing
could
help
patientsbringabou
tmorede
tailin
emotionandcogn
ition
oftheirAM,how
ever,
itmay
notbe
enou
ghto
obtain
riche
rinform
ationin
sensory,tempo
ral,and
contextualinform
ation.Itsugg
eststhat
toelicitmoresensory,tempo
ral,andcontextual
details,req
uiresamorecomplex
encoding
process.
1.0
2)Whe
ntheresearch
provided
less
prob
ing
(i.e.,non
specificcueing
phrases),low
erspecificity
ofAM
was
observed
inpatientsand
theirAM
appe
ared
tohave
less
detailand
richn
esscomparedto
controls.
3)With
moreprob
ing(i.e.,spe
cific
cueing
)in
sensory,tempo
ral,contextual,emotional,
andcogn
itive
areas,patients’AM
was
sign
ificantlylower
inrichn
ess(i.e.,sen
sory,
tempo
ral,andcontextual),bu
tno
tin
details
andspecificity.
43Ricarteet
al.(2014)[75]
Spain
Patients,n=16,w
ithtraining
Patients,n=16,w
ithou
ttraining
•AMT*
1)Patientswho
received
training
show
eda
sign
ificant
increase
inAM
specificity
andde
tail.
DetailedandspecificAMscanbe
learne
dthroug
htraining
amon
gpatientswith
schizoph
renia.Thehypo
thesisof
ruminationin
theCar-FA-X
mod
elwas
employed
toexplain
results;how
ever,itcouldno
tfully
illustratethe
relatio
nshipbe
tweenruminationand
specificity.
0.955
2)Nosign
ificant
change
inde
pressive
moo
dandruminativethinking
stylebe
fore
andaftertraining
forbo
thgrou
ps.
44Heroldet
al.(2015)[76]
Germany
Older
patients,n=25
Youn
gerpatients,n=23
Con
trols,n=21
Allgrou
pswerematched
inge
nder
anded
ucation.
•AMI*
1)Older
patientsshow
edsign
ificant
impairm
entin
episod
icandsemantic
AM
comparedto
controls.
2)Older
patientsrecalledfewer
AM
factsthan
controls.
Thecriticalroleof
thehipp
ocam
pusfor
recollectionwas
emph
asised
bythe
researchers.Furthe
rmore,they
claimed
that
aprog
ressivede
terio
rativecourse
happ
ened
amon
gpatients.
0.864
3)Episod
icAM
(but
notsemantic
AM)was
sign
ificantlycorrelated
with
educationin
the
patient
grou
ps.
4)Hippo
campalvolum
eredu
ctionin
olde
rpatients,which
isalso
detectableto
alesser
extent
inyoun
gerpatients.
5)Hippo
campalvolum
eissign
ificantly
correlated
with
episod
icandsemantic
AM
inpatientsandcontrols.
Zhang et al. BMC Psychiatry (2019) 19:361 Page 18 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
45Bu
ck&Penn
(2015)
[77]
US
Inpatients,n=66
Con
trols,n=50
Samples
werematched
inageandge
nder.
•NET*
1)Con
trolsused
morewords
intheirnarratives
comparedto
patients.
Autho
rsconclude
dthat
assessingsocial
cogn
ition
andlang
uage
features
inpatient
narratives
may
notbe
effectiveforiden
tifying
theirim
pairm
entin
socialcogn
ition
.
1.0
2)Patientsused
fewer
words
associated
with
negativesymptom
s;whe
reas
patients
usingmorewords
appe
ared
tope
rform
better
regardingsocialfunctio
ning
.
3)Patientsused
morepron
ouns
intheir
senten
ces,espe
ciallype
rson
alpron
ouns
(she
,he
,the
y,it,we,I,me,andthem
,etc.),andfirst-
person
sing
ular
pron
ouns
(I;me).
4)Nosign
ificant
differencewas
observed
forusingpo
sitivewords
inapo
sitive
emotionalcon
text,and
negativewords
ina
negativeem
otionalcon
text.
5)Patientswith
ahigh
erfre
quen
cyfor
usingfirst-personappe
ared
toscorelower
inToM.
6)Con
trols’ToM
was
associated
with
negativeem
otionwords
andtheuseof
first-
person
pron
ouns.
46Alle
etal.(2015)[78]
France
Outpatients,n=27
Con
trols,n=26
Samples
werematched
inage,ed
ucation,andIQ.
•Life
narratives
1)Patientsscored
sign
ificantlyhigh
erin
anxietyandde
pression
,and
lower
inself-
esteem
.
Autho
rsbe
lievedthat
patients’lack
ofcohe
rencein
storieswas
relatedto
disorders
oftheself,lack
ofcapacity
inself-reflection,
low
levelsof
executivefunctio
n,men
tal
flexibility,or
metacog
nitiveissues.
1.0
2)Patientsnarrated
theirlifeshorterthan
controls.H
owever,the
rewas
nosign
ificant
differencein
vividn
essin
theirAM
compared
with
controls.
3)In
patients’lifestories,theem
otional
valencewas
less
positivecomparedto
controls.
4)Patients’AM
reason
ing(i.e.,,m
eaning
-making)
andcohe
renceof
storieswere
sign
ificantlypo
orer.
5)Nodifferencewas
observed
inscores
for
cultu
relifescrip
ts.
47Bu
cket
al.(2015)[79]
US
Outpatients,n=41
•IPII*
1)In
patients’narratives,the
iranticipatory
pleasure
was
positivelycorrelated
with
first-
person
pluralpron
ouns
(i.e.,w
e,us,and
our),
andconn
ectio
nto
thepastin
storytelling.
Socializingwith
othe
rscouldmakepatients
feelpleasure.M
oreo
ver,authorspo
intedou
tthat
thecapacity
toexpe
riencepleasure
was
relatedto
one’spast;asseen
inameaning
ful
way
bytheindividu
al.
0.955
2)Also,patients’consum
matorypleasure
was
positivelycorrelated
with
first-person
pluralpron
ouns,and
conn
ectio
nto
thepastin
storytelling.
Zhang et al. BMC Psychiatry (2019) 19:361 Page 19 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
3)Nosign
ificant
relatio
nshipwas
observed
betw
eenpsycho
sissymptom
swith
theability
ofexpe
riencingpleasure.
48MacDou
gallet
al.
(2015)
[80]
Canada
Outpatients,n=24
•To
recollect
3even
tsin
high
lypo
sitive,high
lyne
gative,andne
utral
emotions.
1)Patients’po
orer
perfo
rmance
inep
isod
icmem
oryforne
gativeeven
tspred
ictedtheir
lower
insigh
t(re
gardingsocialconseq
uences)
into
theirillne
ss.
Autho
rssugg
estedthat
AM
perfo
rmance
pred
ictedpatient
insigh
tabou
ttheirmen
tal
illne
ss.
0.909
49Alle
etal.(2016)[81]
France
Stud
y1:
Outpatients,n=20
Con
trols,n=21
Samples
werematched
inage.
Stud
y2:
Outpatients,n=30
Con
trols,n=28
Samples
werematch
inage,levelo
fedu
catio
n,andIQ.
•Life
narratives
with
free
recall(Study
1)•Life
narratives
with
structured
protocol
(Study
2):7
impo
rtanteven
ts.
1)Stud
y1:Nodifferencebe
tweencontrols
andpatientsin
leng
thof
narratives.
Redu
cedglob
altempo
ralcoh
eren
cemay
bedu
eto
lower
levelsof
executivefunctio
ning
.Autho
rsalso
emph
asisethemetho
dof
collectinglifestorieswith
amorestructured
protocol;g
lobaltem
poralcoh
eren
ceam
ong
controlsandpatientswas
enhanced
.
0.955
2)Nodifferencebe
tweengrou
psin
term
sof
localind
icators(i.e.,d
ate,age,lifepe
riod,
anddistance
from
thepresen
t).
3)Stud
y2:Patients’executivefunctio
ning
was
sign
ificantlylower
than
controlsandtheir
narratives
wereshorter.
4)How
ever,p
atients’capacitiesfor
iden
tifying
even
torde
rthroug
hout
the
narratives
(i.e.,g
lobaltem
poralcoh
eren
ce)
werepo
orer
than
controls,and
therewere
moretempo
rald
istortionin
patients’narratives
comparedwith
controlsin
both
stud
ies.
5)With
structured
protocol,con
trolsand
patientsappe
ared
toscorehigh
erin
glob
altempo
ralcoh
eren
ce.
6)Nodifferencewas
observed
intempo
ral
distortio
nandelaborationof
ending
inbo
thstud
ies.
50Holm
etal.(2016)[82]
Den
mark
Outpatients,n=25
Con
trols,n=25
They
werematched
inge
nder,sex,and
levelo
fed
ucation.
•SD
Ms*
•Life
StoryChapters
1)Patientsrepo
rted
morene
gativelife
chapters;highe
ranxietyandde
pression
than
controls.
Neurocogn
itive
functio
ning
(i.e.,including
the
self-reflectionfunctio
n)may
bevitalfor
con
structingcohe
rent
lifestories,andpatients
recruitedin
thecurren
tstud
ywereconsidered
tobe
wellfun
ctioning
.Pasttraumaticeven
ts,
loss
ofsocialinteraction,aw
aren
essof
their
illne
ss,and
ahigh
levelo
fanxietyand
depression
couldbe
reason
sthat
patients
ratedtheirlifestoriesne
gatively.
0.955
2)Patients’ne
gativelifechapterswereno
tcorrelated
with
theirde
pressive
symptom
s.
3)Nosign
ificant
differencein
causal
cohe
rence,self-continuity
andcentralityto
iden
titybe
tweenpatientsandcontrols.
4)Patientswith
good
perfo
rmance
incogn
itive
testshave
high
ercausalcohe
rence
oflifestorychaptersandSD
Ms.
51Alle
etal.(2016)[83]
France
Outpatients,n=27
(no
depressive
symptom
s,and
IQabove70)
Con
trols,n=27
Samples
werematched
in
•Life
narratives
•CES*
1)Nocorrectio
nbe
tweenself-continuity
and
executivefunctio
n,self-esteem
,and
symptom
sof
illne
ss
Metacog
nitivedysfun
ctioncouldplay
arolein
deficitin
self-continuity
(i.e.,p
heno
men
olog
ical
continuity;narrativecontinuity).Pasttraumatic
even
tscouldmakepatientsrate
theirem
otions
asne
gativeregardingtheirpastexpe
riences.
1.0
2)Vividn
essof
pasteven
ts(i.e.,
Zhang et al. BMC Psychiatry (2019) 19:361 Page 20 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
age,IQ,and
levelo
fed
ucation.
phen
omen
olog
icalcontinuity)was
lower
inpatients.
3)Patientsappe
ared
tohave
morene
gative
emotions
abou
tthepastthan
controls.
4)Patientsappe
ared
tohave
lower
self-
even
tconn
ectio
nscomparedwith
controls.
52Moe
etal.(2016)[84]
US
Patients,n=47
Con
trols,n=32
Samples
werematched
inageandge
nder.
•IPII*
(with
STAND*)
1)Nodifferences
betw
eencontrolsand
patientsin
word-coun
tfortheirnarratives.
Autho
rssugg
estedthat
idea
density
was
more
relatedto
thenarrativede
velopm
entto
self-
processinsteadof
reflectionin
interactions
with
,orevaluatio
nsfro
m,others.Patient
illne
ssmight
overtake
thesenseof
iden
tityandsense
ofselfandturn
them
into
self-stigma.
Therefore,patientswith
greateridea
density
gained
moreinsigh
t;thereafter,m
ore
depression
,anxiety,and
lower
motivation
inlife.
1.0
2)Patientshadlower
idea
density
(i.e.,
accoun
tof
inform
ation)
intheirnarratives
comparedwith
controls.
3)Patients’idea
densities
wereno
tcorrelated
with
yearsof
educationor
Global
Assessm
entof
Functio
ning
.
4)Patients’idea
densities
werene
gatively
correlated
with
theirpo
sitivesymptom
s;lack
offlow
inspeech.
5)Theiridea
densities
werealso
associated
with
levelsof
insigh
tinto
theirillne
ss,and
senseof
controlinlife.
6)Patientswerede
pressedandanxiou
stend
edto
have
high
erlevelo
fdifficulties
with
motivation.
53Holm
etal.(2017)[85]
Den
mark
Patients,n=25
Con
trols,n=25
Samples
werematched
inage.
•SD
Ms*
1)Patientsshow
earlier
reminiscencebu
mps
(i.e.,15–19)than
controls(i.e.,25–29).
Autho
rsexplaine
dthat
toob
tain
thediagno
sis
impairedtheform
ationof
SDMs.Moreo
ver,
patient’searly
bumpindicatedthat
thepe
riod
ofob
tainingthediagno
sishapp
ened
durin
gearly
adulthoo
d.Furthe
rmore,authorsbe
lieved
that
thene
gativesymptom
sassociated
with
patient’sfewer
SDMs,andmem
ories,may
not
beretained
aftertheon
set.
0.955
2)69%
ofpatient
mem
orieswere
distrib
uted
over
theyearsbe
fore
diagno
sis,
whe
reas
27%
oftheirSD
Mswereafter
diagno
sis,andon
ly4%
ofmem
orieswere
locatedwith
intheyear
ofdiagno
sis.
3)Patientswith
morene
gativesymptom
sappe
ared
torecollect
theirmem
oriesless,
espe
ciallyafterdiagno
sis.
54Willits
etal.(2018)[86]
US
Patients,n=200
Peop
lewith
HIV
ascontrols,n
=55
Samples
werematched
inageon
ly.
•IPII*
(app
liedCoh
-Matrix)
1)Patientsprod
uced
less
speech
inop
en-
ende
dinterviews,andmoreun
ique
words
comparedto
controls,sug
gestingpatients’
tend
ency
tojumpfro
mon
etopicto
anothe
r.
Autho
rsstated
that
results
supp
ortedBleuler
andJung
’sideasthat
peop
lewith
schizoph
reniahave
difficulties
inconn
ectin
gideas,andthey
oftentend
toform
acomplicated
narrativeflow.M
oreo
ver,authors
men
tione
dthedisturbancein
thesenseof
self,
andmetacog
nitiveconcerns
relatedto
theirdifficulties
inconstructin
gtheir
lifestories.
0.955
2)Patientsprod
uced
lower
causal(e.g.,
because),log
ical(e.g.,and),and
contrastive(e.g.,
althou
gh)con
nections
intheirnarratives,
sugg
estin
gpatientsleftothe
rsou
tto
makesenseof
theseessentiallinks
Zhang et al. BMC Psychiatry (2019) 19:361 Page 21 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
intheirlifestories.
3)Patientsprod
uced
high
erintentional
conten
t,andlower
causalandintentional
cohe
sion
,ind
icatingthat
patientsoften
lack
clarity
whe
ncomingto
both
goal
andno
n-go
alactivities
with
othe
rpe
ople
4)Patientsscored
lower
inde
epcohe
sion
comparedto
controls,ind
icatingpatientswere
less
likelyto
providelinks
forpe
opleto
unde
rstand
theirstories
55Alexiadou
etal.
(2018)
[87]
Greece
Patients,n=40
Con
trols,n=40
Samples
werematched
inage,ge
nder,edu
catio
n,andIQ.
•QAM*
1)Con
trolspe
rform
edbe
tter
than
patients
inlistlearning
,story
recall,andverbalfluen
cy.
Due
tosymptom
sof
disorder,p
atientshadless
ofasociallife,he
ncefewer
mem
oriesto
share.
Thismight
berelatedto
theSM
S.SM
S:theworking
selftakestheroleof
control
inretrieving
anden
coding
processes,and
patients’go
alsandintentions
might
berestricted,
henceretrieving
fewer
specific
mem
ories.
Functio
nalavoidance:p
atientsmight
have
uncomfortablefeelings
whe
nrecalling
their
recent
lifeeven
tsdu
eto
theirlifecontext(i.e.,
beingho
spitalised
).
0.955
2)Onlyrecent
lifepe
riodpatients
perfo
rmed
worse
than
controlsin
recalling
mem
ories,aftercontrolling
variables
forverbal
mem
oryandverbalfluen
cy(byusing
hierarchicalregression
analysis).
56Nieto
etal.(2018)[88]
Spain
Inpatients,n=24
Outpatients,n=29
Con
trols,n=69
Samples
werematched
inage,ge
nder,and
education.
•AME*
1)Patientsexpe
rienced
high
erlevelsof
depressive
symptom
scomparedto
controls,
andtheirpe
rform
ance
inworking
mem
ory
taskswas
sign
ificantlyworse
than
controls.
Metacog
nitivede
ficits
couldmakepatients
have
difficulty
ininteractingwith
othe
rs,h
ence
they
hadfewer
things
toshareabou
ttheir
lives.
Thehigh
numbe
rof
norepo
rted
mem
ories
from
childho
odin
patientsappe
ared
tosupp
orttheframew
orkof
theCARFAX
mod
el’sfunctio
nalavoidance
mechanism
.Childho
odtraumawas
considered
afactor
that
contrib
uted
tolaterpsycho
ticsymptom
s.How
ever,autho
rsacknow
ledg
edthat
since
childho
odtraumawasn’tmeasured,
the
finding
ofim
pairedspecificity
ofmem
ories
durin
gchildho
odshou
ldbe
reconsidered
.
1.0
2)Fewer
mem
oriesrepo
rted
bypatients
durin
gchildho
odwas
sign
ificant
comparedto
controls.
3)Thosepatientspe
rform
ingbe
tter
inworking
mem
orytasksprod
ucemore
mem
oriesdu
ringchildho
od,and
morespecific
mem
oriesdu
ringearly
adulthoo
d.
4)To
recallAM
durin
gadolescence,
patientswith
ahigh
ernu
mbe
rof
sensations
andem
otions
appe
ared
tohave
lower
scores
forpsychiatric
symptom
s.
5)Patients’de
pressive
symptom
swere
negativelycorrelated
with
numbe
rof
specific
AMsdu
ringthepreced
ingyear
6)Po
sitivecorrelationob
served
betw
een
lack
ofchildho
odmem
oriesandpsychiatric
symptom
s.
7)Patientsrecalledless
specificAM,m
ore
Zhang et al. BMC Psychiatry (2019) 19:361 Page 22 of 36
Table
1Extractio
nTables
forSelected
Stud
ies(Con
tinued)
Nam
eof
theStud
ies
Samplesize
Assessm
ent/Measure
Summaryof
finding
sInterpretatio
nQuality
check
gene
ralA
M,and
expressedfewer
emotions
comparedto
controls.
57Holm
etal.(2018)[89]
Outpatients,n=24
Con
trols,n=24
Samples
werematched
inage,ed
ucation,andlevel
ofde
pression
.
•Narrativeinterview
1)Noleng
thdifferences
betw
eenpatientsand
controlsin
theirstories.
Autho
rsexplaine
dthat
patientsin
thecurren
tstud
yseem
edto
have
high
ered
ucationand
cogn
itive
functio
ns.The
authorsstated
that
cogn
itive
functio
nwas
impo
rtantto
gene
rate
tempo
ralm
acrostructureor
cohe
rence.An
unfulfilledne
edof
agen
cyandcommun
ion
sugg
estedasenseof
notbe
ingcontrolin
one’sow
nlifeandane
edforclose
relatio
nships.
1.0
2)Nodifferencein
numbe
rof
chapters
iden
tifiedbe
tweengrou
ps.
3)Nodifferencewas
observed
intempo
ral
macrostructure(i.e.,age
ncyandcommun
ion).
4)Bo
thgrou
psshow
edno
differences
intheextent
ofbe
ginn
ings
anden
ding
sof
their
stories.Bo
thgrou
psappe
ared
toelaborate
morein
ending
s.
5)Patientshadsign
ificantlyless
agen
cy(i.e.,
need
tobe
incontrolo
fone
’slife)
fulfillm
ent.
6)Patients’storieshadsign
ificantlymore
unfulfilledcommun
ion(i.e.,the
need
for
intim
aterelatio
nships,friend
ship,rom
ance,
sharing,
andbe
long
ingn
ess)them
es.
ABM
E*:A
utob
iograp
hicalM
emoryEn
quiry
AME*:A
utob
iograp
hicalM
emoryEn
quiry
AMI*:A
utob
iograp
hicalM
emoryInterview
AMT*:A
utob
iograp
hicalM
emoryTest
CES*:Cen
trality
ofEven
tScale
E-AGI*:Erw
eitertes
Autob
iograp
hische
sGed
ächtnisinterview
IAPS
*:Internationa
lAffectiv
ePictureSystem
IPII*:Ind
iana
Psychiatric
Illne
ssInterview
MCQ*:Mem
oryCha
racteristicsQue
stionn
aire
NCRS
*:Narrativ
eCoh
eren
ceRa
tingScale
NET*:Narrativ
eof
Emotions
Task
QAM*:Que
stionn
aire
ofAutob
iograp
hicalM
emory
SDMs*:Self-de
finingmem
oriesqu
estio
nnaire
SDS*:Sched
uleforDeficitSynd
rome
STAND*:Scaleto
AssessNarrativ
eDevelop
men
t
Zhang et al. BMC Psychiatry (2019) 19:361 Page 23 of 36
Table 2 Research Methods for Selected Studies
Generative retrieval type Specific method or measure Studies in chronological order
Cue word/picture method (17 studies) Autobiographical Memory Test [90] ▪ Kaney, et al., 1999 [38]
▪ Harrison & Fowler, 2004 [42]
▪ Iqbal et al., 2004 [43]
▪ Mcleod, Wood, & Brewin, 2006 [47]
▪ Warren & Haslam, 2007 [52]
▪ D’Argembeau et al., 2008 [53]
▪ Blairy et al., 2008 [54]
▪ Taylor et al., 2010 [60]
▪ Pettersen et al., 2010 [63]
▪ Cuervo-Lombard et al., 2012 [67]
▪ Ricarte et al., 2012 [68]
▪ Ricarte et al., 2014 [72]
After giving a specific AM in response to a cue word, theparticipants were asked to give a title to the AM. This titlewas then used as a cue to evoke subsequent specificmemories
▪ Morise et al., 2011 [65]
International Affective Picture System [91]. ▪ Neumann et al., 2007 [51]
Narrative of Emotions Task (NET [92];), to provide simple(i.e., happy, sad), complex (i.e., suspicious, surprised), andself-conscious emotions (i.e., ashamed, guilty) to elicit theirstories.
▪ Buck & Penn, 2015 [77]
Participants were asked to provide three events in natureof highly positive, highly negative, and neutral stories. Thescoring system from The Autobiographical Interview(AI [93];)
▪ MacDougall et al., 2015 [80]
Schedule for Deficit Syndrome (i.e., SDS) [94] ▪ Gruber & Kring, 2008 [55]
Life stages method (14 studies) Autobiographical Memory Interview (AMI [95];) ▪ Feinstein et al., 1998 [37]
▪ Corcoran & Frith, 2003 [41]
▪ Mcleod et al., 2006 [47]
▪ Boeker et al., 2006 [48]
▪ Mehl et al., 2009 [59]
Autobiographical Memory Inquiry [96] ▪ Riutort, et al., 2003 [40]
▪ Potheegadoo et al., 2014 [74]
Autobiographical Memory Enquiry (i.e., ABME) [97] ▪ Danion et al., 2005 [44]
▪ Ricarte et al., 2012 [68]
▪ Potheegadoo et al., 2012 [69]
▪ Potheegadoo et al., 2013 [71]
▪ Nieto et al., 2019 [88]
Erweitertes Autobiographisches Gedächtnisinterview (E-AGI Interview [98];) in 5 life time periods
▪ Herold et al., 2013 [30]
▪ Herold et al., 2015 [76]
Questionnaire of Autobiographical Memory (QAM),including 1) The Personal Semantic Memory scale (i.e.,semantic AM), and 2) The Autobiographical Incidentsscale (i.e., episodic AM), to access in 3 different life periods
▪ Alexiadou et al., 2018 [87]
Open-ended retrieval method (26 studies) Free recall of 50 events from participants’ lives andassociation of dates to these events [99].
▪ Elvevåg et al., 2003 [39]
Free recall of 20 important events from participants’ livesand attribution of ages and times for each event [100]
▪ Cuervo-Lombard et al., 2007 [50]
Zhang et al. BMC Psychiatry (2019) 19:361 Page 24 of 36
self-identities. Two additional studies [39, 50] asked par-ticipants to freely recall a number of past events anddate them. One study [50] used a method [100] origin-ally utilised by Holmes and Conway [100], in which par-ticipants freely recalled 20 important life events andprovided an age and time for each.Another open-ended retrieval method asked partici-
pants to keep a dairy. One study [62] encouraged partici-pants to record four diary entries per day for 1 month,requiring participant motivation to complete this timeconsuming task for a successful study. Another study[70] employed the Twenty-Statements Test comprising“I am” statements to activate AMs and understand par-ticipants’ self-images and related AMs.The Life Story Chapter [102] retrieval method was
employed in one study [82] to elicit AM. It asks partici-pants to recall their stories and divide them into chap-ters. Another three studies [78, 81, 83] used the LifeNarrative method [103] which encourage participants to
write down their seven most important events on cards,and then narrate them into a life story after arrangingthese cards in a temporal sequence.
Features of autobiographical memoryCue word/picture methodMost studies using a cue word or picture method re-vealed that patients with schizophrenia tended to reportless specific AMs [38, 47, 52, 53, 72], fewer total memor-ies [51], and more categorical memories [38, 42, 47, 52,53]. However, one study [67] found no significant differ-ence in specificity of AM between patients and controls.Patients and controls responded differently to positiveand negative cues. One study [38] reported that patientsprovided more specific AMs for negative cue words andless specific memories for positive cue words. These re-sults contradict another study [51] in which patientsresponded to positive picture cues with more specificmemories. One study [55] revealed that patients
Table 2 Research Methods for Selected Studies (Continued)
Generative retrieval type Specific method or measure Studies in chronological order
Singer & Moffitt’s (1992) Self-defining memories (SDMs)questionnaire requiring participants to recall threeimportant memories which help to define who they are.
▪ Raffard et al., 2009 [58]
▪ Raffard et al., 2010 [64]
▪ Berna et al., 2011a [66]
▪ Berna et al., 2011b [66]
▪ Holm et al., 2016 [82]
▪ Holm et al., 2017 [85]
Diary record [101] ▪ Pernot-Marino et al., 2010 [62]
Kuhn & McPartland’s (1954) “Twenty-Statements” Test(TST) of I am statements
▪ Bennouna-Greene et al., 2012 [70]
Life story chapters [102] requiring participants recall theirlife stories, and divide them into different chapters.
▪ Holm et al., 2016 [82]
Life Narrative [103]: to recall 7 the most important pastevents, and narrate a story with those memories
▪ Alle et al., 2015 [78]
▪ Alle, d’Argembeau, et al., 2016 [83]
▪ Alle, Gandolphe, et al., 2016 [81]
Indiana Psychiatric Illness Interview (i.e., IPII) [104]. IPII is toaccess one’s narrative with mental illness, including theirlife story, their understanding of illness, and livedexperience of having such illness, and lastly how theillness control or being controlled.
▪ Lysaker, Davis et al., 2005 [45]
▪ Lysaker, France et al., 2005 [45]
▪ Lysaker, Buck et al., 2006 [49]
▪ Lysaker, Buck et al., 2008 [56]
▪ Roe et al., 2008 [57]
▪ Lysaker et al., 2008 [56]
▪ Buck et al., 2015 [79]
▪ Moe et al., 2016 [84]
▪ Willits et al., 2018 [86]
Narrative interview: “tell a story of your life”, “describeyourself as fully as you can”
▪ Lysaker, et al., 2005 [46]
▪ Saavedra, 2010 [61]
▪ Moe & Docherty, 2014 [73]
▪ Holm et al., 2018 [89]
Zhang et al. BMC Psychiatry (2019) 19:361 Page 25 of 36
reported less clear but lengthy descriptions of AMs inresponse to negative cues; yet their memories were morelikely to involve others when responding to positivecues. Patient memory retrieval time varied whenresponding to cues. In two studies [38, 52], patients tooka longer time to complete retrieval compared to con-trols, while in an opposing study [47], patientsresponded more quickly to cues.Anxiety and depression levels were found to be
higher among patients with schizophrenia than con-trols [52, 60], and these levels were positively corre-lated with avoidance relating to their illness [42].Patients with depressive symptoms generated moregeneral memories, especially towards positive cues;however, they seemed to have better insight regardingtheir psychological conditions than patients withoutdepressive symptoms [43]. Additionally, patients’ im-paired ability to produce more specific memories tonegative cues predicted lower insight into their ill-nesses [80].The relationship between patients’ comorbid depres-
sion and memory specificity is not conclusive. One study[60] indicates that patients’ depression levels highly cor-relate with memory specificity. However, two studies[54, 72] reported no such relationship. Risk of attemptedsuicide was high among patients with schizophrenia [1].One study [60] revealed that patients with a history ofattempted suicide reported higher levels of depressivesymptoms and generated more specific AMs comparedto patients without this history. Yet, another study, [63]reported that patients with a history of attempted suicidewere more likely to produce less specific AMs comparedto patients who have no such history.Although patients with schizophrenia who take part in
AM studies are generally stabilised by medication, theirresponses are occasionally “uninterpretable”. Thus, re-searchers find it difficult to make sense of how retrievalcues are related to the given memories for these re-sponses [47]. Specifically, when negative cues are used,some patients’ memory descriptions are quite scattered[38, 60]. In one study [42], the recall of less specific AMswas associated with more negative psychotic symptomsin patients. Another study [53] reported that patientswith greater positive psychotic symptoms were morelikely to produce less specific AMs. However, one study[51] stated no such relationship.Nevertheless, one study [54] notices that patients’
memory specificity is not associated with psychoticsymptoms, social functioning, depression, or anxiety, butwith their executive function. Patients with negativesymptoms offered shorter descriptions of their stories;the more first-person pronouns they used, the poorerunderstanding they had about other’s emotions and in-tentions (i.e., ToM) [77].
Cue word/picture studies mostly support the notionthat patients with schizophrenia recall less specific, andmore categorical, AMs, and respond differently to posi-tive and negative cues than controls. The link betweenthe history of suicide attempts and AM specificity, andthe relationship between psychotic symptoms and AMspecificity, remain unclear.
Life stages methodStudies grouped into this category implemented the lifestages method to evoke participants’ AMs. Findings weresimilar to those studies using cue word/picture methods.For instance, AMs among patients with schizophreniaappeared to be less specific [40, 41, 44, 59, 69, 71, 74,88], and fewer in number [44, 59, 69], when comparedwith controls. This method, however, produced uniqueresults. When patients’ AM specificity was distributedover the lifespan, “U-shaped” patterns appeared [37, 47,48]. The patients’ AM retrieval was most impaired forearly adulthood [37, 47, 68], and least impaired for child-hood [37, 68] and recent years [47]. Research [47] sug-gests that early adulthood coincides with the onset ofpsychotic symptoms in many patients, resulting in lessspecific AMs. However, a recent study [87] has not con-firmed these results, showing that patients’ memory per-formance from the recent years was poorer than forcontrols. Another study [88] found that the lack ofmemories from childhood was positively correlated withcurrent psychotic symptoms.When examining personal facts (i.e., semantic memor-
ies) in AMs, patients and controls demonstrated no dif-ference [37]. However, patients performed better whenretrieving recent personal facts than those from child-hood [47]. The capacity for retrieving personal events(i.e., episodic memories) from all life periods was signifi-cantly impaired in patients compared to healthy controls[37]; however, opposing results from another studyfound that the deficit in recalling episodic memoriesonly occurred in the recent life period [87] . One study[41] reported that patients tended to recall strange nega-tive events from childhood, suggesting the possibility ofhaving traumatic life experiences during childhood. In-deed, one review reported a causal relationship betweenchildhood trauma, such as sexual and emotional abuse,and the patients’ current psychotic symptoms [107].Researchers [68] revealed that mild depression corre-
lated strongly with better memory recollection amongpatients with schizophrenia without retrieval training.They found that from 10 years old to the age of symp-tom onset (approximately 18–19 years), patients’ depres-sion symptoms were lower while AM specificity washigher. This is consistent with the U-shaped retrievalpattern. After memory retrieval training [68, 75], patientmemory retrieval improved, yet, there was no significant
Zhang et al. BMC Psychiatry (2019) 19:361 Page 26 of 36
correlation between emotion and AM retrieval, indicat-ing memory specificity levels were not related to changesin emotion (e.g., feelings of depression). Similar resultswere observed in another study [71] that found no rela-tionship between depression and recollection.Related to the ToM, one study [59] focused on how
retrieval patterns illustrated that patients’ AM deficitswere more strongly associated with a lack of ability toinfer other’s intentions than to understand their emo-tions [108–110]. The researchers [59] indicated that pa-tients with schizophrenia may have difficultyunderstanding other’s intentions or behaviors such asinterpreting the meaning of conversations or body lan-guage. Another study [68] reported that patients’ capaci-ties to retrieve past events were strong predictors ofsocial performance.One study [69] revealed that patients offered largely
objective explanations of the importance of their mem-ories, whereas controls provided mostly subjective expla-nations for their recalled memories. Older patients (i.e.,mean age = 56) demonstrated significant impairment inAM (i.e., both episodic and semantic memories) com-pared to younger patients (i.e., mean age = 33) [76]. Twostudies [47, 68] employed cue word and life stagesmethods to collect patient AMs. These studies revealedthat patients recollected more specific events when givenword cues and recollected a greater number of totalevents in the life stages method.
Open-ended retrieval methodTwenty-six studies [39, 45, 46, 49, 50, 56–58, 61, 62, 64,66, 70, 73, 78, 79, 81–86, 89] used open-ended retrievalmethods. Under this method, the studies were morelikely to focus on the quality of AMs, such as meaningmaking, content, insight, self-worth, coherence, temporalconceptual context, plausibility, and so on. In addition,the results were similar to those that used cue word/pic-ture and life stages methods. Patients with schizophreniaproduced fewer memories than controls [39], and theirmemory specificity was lower [50, 70]. Additionally, pa-tients produced more memories with high specificitypreceding the age of psychotic symptom onset [39], sup-porting the U-shaped memory retrieval from the lifestages recollection method [37, 47].The patients recollected most of their memories from
22 years of age as opposed to 27 years of age for controls;and patients’ reminiscence bumps were also earlier [50].Similarly, two studies [58, 85] reported patients’ reminis-cence bumps to be temporally located from ages 15–19,and controls’ bumps from ages 20–24, or 25–29, re-spectively. Patients tended to recall more past events re-lated to work and education than for births and deaths[50]. Controls were more likely to recall their pastthrough intense emotional events [50], supporting other
results [69] indicating that patients provide an objectiveexplanation for important events while controls providea subjective explanation.One study [58] reported that patients with schizophre-
nia had a tendency to recall more memories relating tohospitalisation or stigmatisation rather than achieve-ment, as compared with controls. A similar theme wasfound in one study [66] in which patients with schizo-phrenia tended to retrieve more traumatic memoriesthan controls: 71% of these memories related to psych-otic episodes while 29% related to other events that con-tributed to their disorders. Three studies [78, 82, 83]discovered that patients often rated their past as nega-tive; however, recalling negative experiences was not as-sociated with their level of depressive symptoms [82].The content of memory produced by patients ap-
peared to be less coherent regarding the context andtheme. As far as the meaning making of events, studiesrevealed that patients produced less meaning makingthan controls [58, 64, 66, 78, 86]. Additionally, patientstended to use less temporal coherence [81] and lesscausal (e.g., “because”), logical (e.g., “and”), and contrast-ive (e.g., “although”) words in their storytelling [86]. Butnot all patient samples showed the same tendencies.Holm and colleagues [82] reported neither significantdifferences between controls and patients in terms ofAM causal coherence and centrality to identity, nor thelength of stories, their temporal coherence, number oflife chapters, or themes produced [89].Compared with healthy controls, patients’ AMs ap-
peared to be lower in self-worth and agency [46, 73],meaning that they tended to connect with others pas-sively, viewed the self as negative, and believed that theirlives were not under their own control. These findingsare supported by a recent study [89] stating that patientsexpressed their lack of fulfillment in agency and inter-personal relationships.Patients’ insight into their own mental health condi-
tions affected their AMs. Patients who denied the diag-noses or symptoms tended to have lower insight [57].The patients with low insight produced less detailedAMs that lacked temporal conceptual connection andplausibility [45]. Vocational rehabilitation enhanced theAM coherence of patients with average insight, but didnot for those with lower levels of insight [45]. Some pa-tients with more insight seemed to have increased socialfunctioning (i.e., ToM) [49, 56] and abstract thoughts[48], and were more motivated and hopeful [49] in life.However, others appeared to be more depressive andhave lower motivation in life [84]. Patients’ poor levelsof insight were associated with more psychotic symp-toms [49] and with poorer quality AMs [107]. However,their AM quality was not associated with their past ex-periences of being rejected socially [56].
Zhang et al. BMC Psychiatry (2019) 19:361 Page 27 of 36
In terms of patients’ language, the more first-personplural pronouns (i.e., we, us, and our) used, the more an-ticipatory pleasure and greater connection with theirpast they experienced [79], indicating that socializingwith other patients was pleasant. Patients who stayedlonger in care homes produced stories that delineatedrelationships and home activities, and were more coher-ent and less delusional compared to the stories producedby patients whose stay in care homes was shorter [61].In one study, patients were able to experience vividnessof their past just like healthy controls [78], but an oppos-ing result was observed in another study [83] in whichthe level of vividness was found to be lower in patients.
Theoretical accountsVarious SMS schemes were employed in eight out of 57reviewed articles to interpret why patients with schizo-phrenia often recall less specific AMs. According tothese eight studies, this phenomenon of patient AMnon-specificity might be due to the abnormality of per-sonal identity [40], the disturbing concept of self [47],the goal of avoiding distressing memories [60], orunclear goals and intentions [47, 59, 87]. A defect inexecutive function was also suggested [44]. The uncon-ventional reminiscence bump [50] and frequency ofreporting inconsistent memories [62] in patients withschizophrenia was attributed to the abnormal formationof life goals. Additionally, vague descriptions were pro-vided while applying the SMS framework; it was notmade clear how the goals and identity of an individualcould play a role in the memory retrieval process.Only three studies employed the CaR-FA-X model to
illuminate the possible reason for less specific AMs inpatients with schizophrenia [43, 72, 75]. The first study[72] emphasised that the executive function is crucialduring retrieval. The second study [63] stated that avoid-ance played a role in producing overgeneral AM amongpatients. The third study [53] employed the ruminativehypothesis in the CaR-FA-X model to explain the reduc-tion in specificity in AM among patients, however, theresult was not supportive to the theory as the patients’ruminative thinking pattern remained unchanged al-though their AM specificity significantly improvedthrough training.Some studies highlighted the importance of working
memory, executive function [48, 67, 81, 89], and meta-cognition [45, 56, 58, 64, 78, 80, 82–84, 86, 88] inexplaining high quality AM (e.g., AM with specificity, in-ternal coherence, length of narratives, and temporal con-ceptual context). A few studies mentioned thatschizophrenia itself disturbed patients’ AM, especiallythe onset of the illness [68, 69] and its psychotic symp-toms [45, 46, 49, 53, 66, 85]. Other studies stated that
patients’ attitudes [57] or emotional states [63, 65, 70]had a significant impact on their memory retrieval.Results from the remaining papers did not apply any
theoretical framework but offered some general interpre-tations. Some authors discussed inefficient encodingstrategies as the reason for patients recalling fewer AMs[39, 40, 50], while others emphasised the abundance ofunpleasant life experiences [38, 41, 60] and general re-trieval deficit [39, 47, 51]. Two studies mentioned thatpatients with schizophrenia follow an overgeneral mem-ory retrieval pattern without much elaboration [52].
Enhancing memory specificity and coherenceSeveral studies [45, 54, 68, 74, 75, 81] reported that pa-tients’ memory specificity and coherence could be im-proved through both intervention and memoryactivation methods. Two studies from Ricarte and col-leagues [53, 91], using different intervention and re-trieval methods (i.e., life stage and cue-word), reportedsimilar results that patient’s AM specificity and detailimproved. However, the study [53], which employed LifeReview therapy resulted in no change in patients’ moodsor ruminative thinking patterns. The other study [91],which utilised event-specific training, resulted in differ-ences in patients’ depression levels. These competing re-sults are perhaps due to the intervention’s trainingobjectives. Life Review therapy focused on positive pastevents, but did not make patients feel better afterwards.Event-specific training was more likely focusing on pa-tients’ self-defining memories, which would be helpful indecreasing their depressive mood.Blairy and colleagues [54] supported the results that
AM specificity could be improved. They employed Cog-nitive Remediation therapy—exercising the recollectionof memories through a written dairy. Although theywere able to generate specific AMs, patients’ low moodsremained. Holm and colleagues [89] discovered thatpatients reported greater unfulfilled communion, in-dicating that they wished to have close relationshipsor friendships. Future research could explore thecorrelation between patients’ moods and having closerelationships.Lysaker and colleagues [41] reported that narrative co-
herence of patients with an average level of insight wasimproved in a 5-month vocational rehabilitationprogramme. They believed that through working andinteracting with others in the workplace, patients gaineda sense of identity and recognised their personal poten-tial, which then enhanced their narrative coherence.However, insight might be hard to obtain. One studystated that insight is culturally structured since patients’insight levels are positively correlated with the insight oftheir family members [111].
Zhang et al. BMC Psychiatry (2019) 19:361 Page 28 of 36
Potheegadoo and his team [74] discovered that byadopting specific cues, patients with schizophrenia wereable to recollect memories in detail with no difference inspecificity from controls. The specific cues provided(e.g., “how did you feel when this event happened?”; “doyou remember the thoughts you had at that very mo-ment?”) might help patients to elaborate further whileretrieving and constructing their memories. Patientsmight have difficulty expressing from their narrativeexactly what researchers are looking for (i.e., a matchwith the scoring standard), as previous studies mentionthat patients’ ToM is weaker than controls [59, 68, 77].More importantly, this study [74] highlighted an ideathat the lack of specificity in AMs could be due to a lackof communication or elaboration skills, as the patients’illness caused them to withdraw from social interactions.Alle and colleagues [82] discovered similar results
from adopting a more structured protocol to elicit pa-tients’ AM (i.e., asking patients to write down the 7 mostimportant events on 7 cards; narrate them into a fullstory after arranging them in temporal sequence). Eitherproviding more specific cues, or a more structuredprotocol, would likely help patients with schizophreniagenerate more specific memories. Future research couldconcern itself with the best method for accessing AM inpatients with schizophrenia.
DiscussionThis systematic review has extracted four themes, whichhelped to answer our research questions. The first themesummarises all the memory activations methods com-monly used in previous studies. The second theme high-lights the features and content of patients’ AM togetherwith the role of comorbid depression and history of sui-cidal attempt in memory specificity. The third themesynthesises the theoretical accounts of patients’ memory.The fourth theme summarises the ways by which onecould enhance patients’ memory specificity and coher-ence. We discuss some additional findings on the rela-tionships between psychotic symptoms and patients’memory specificity.
Memory activation methodsResearch invariably shows that all studies used the gen-erative retrieval strategy: giving cues to evoke autobio-graphical memories. The presentations of cues were ineither words, pictures, life stages, or open-ended ques-tions. Some results appear common across studies re-gardless of cuing method. For example, patients withschizophrenia retrieve less specific AMs compared tocontrols—only three studies [58, 64, 67] illustrated nodifference in AM specificity, and one study [89] statedno difference in length, number of life chapters, or tem-poral macrostructure.
Suicide attempts, comorbid depression, and AMspecificityComorbid depression was common among patients withschizophrenia, with several studies reported patientshaving higher levels of depression compared to controls[52, 60, 71, 72, 78, 82, 88]. However, the relationship be-tween patients’ level of depression and memory specifi-city was not clear. One study [60] indicated thatpatients’ depression levels were correlated with theirmemory specificity, while others showed no relationshipbetween depression and memory specificity [54, 72], nar-rative disruption [46], negative life chapters [82], ormemory recollection in the Field perspective [71]. It wasalso found that although patients’ AM specificity im-proved through intervention, their levels of depressionremained unchanged [54, 75], indicating the independ-ence of depression and memory specificity. Evidenceshows that patients with depressive symptoms have bet-ter insight than those without depression [43]. Anotherstudy revealed that patients with higher levels of insightwere more depressed; thus, were less motivated in life[84].The patients with a history of attempted suicide gener-
ated more specific AMs compared to patients withoutsuch history [60]. However, another study showed thatpatients with a history of attempted suicide were morelikely to produce less specific AMs compared to patientswithout this history [63]. These contradictory resultscould be attributed to the sample size and types of pa-tients involved in the studies. While the first study re-cruited only outpatients (N = 60), the second studyinvolved mostly inpatients (N = 23) and a smaller num-ber of outpatients (N = 9). In a recent study, outpatientsperformed better in several neurocognitive tasks, such asprocessing speed, working memory, and attention, com-pared to inpatients [112]. Better neurocognitive functionamong outpatients could explain why they, despite hav-ing a history of attempted suicide, were able to producemore specific AMs than inpatients.
Distribution of AMs across the patients’ lifespanStudies [37, 39, 47] examining AM specificity illustratepatients having a U-shaped distribution, meaning theyrecollected more specific memories from childhood andrecent years than early adulthood. However, the U-shaped retrieval pattern was absent in a recent study[87]. The lifespan distribution of patients’ typical AMsdemonstrated an earlier reminiscence bump comparedto healthy controls: 15–19 years for patients, and 20–24years for functioning individuals [50, 58]. The partici-pants’ average age at events was 22 years for patients and27 years for controls. The early reminiscence bump forpatients is probably due to the early onset of their ill-ness; in many cases in their early adulthood, which may
Zhang et al. BMC Psychiatry (2019) 19:361 Page 29 of 36
have resulted in the reduced recollection of memoriesfrom that period [113]. When functioning individualswere able to adequately encode events from early adult-hood, the patients faced difficulty in doing so because ofinsomnia [114] and other neurodevelopmental abnor-malities [115, 116]. As the patients were likely to showreduced awareness of the events taking place at a timewhen their disease symptoms started to surface, theirmemory recollection from that period dropped, resultingin the early closure of their reminiscence bump.The identity account of the reminiscence bump [64,
117–119] could be employed to make sense of thesefindings. Normally, young people develop their self-identity during adolescence and early adulthood [120]. Ifan individual goes through a normal developmentalprocess, there will be a privileged encoding of many ofthe events occurring during this period and later inte-grated with their lifelong narratives, thus enhanced ac-cessibility to those memories later in life [121]. If anindividual shows symptoms of schizophrenia duringearly adulthood, events occurring at that time would re-ceive reduced attention and likely be disintegratedwithin their personal narrative. This is the reason for pa-tients showing an inability to recall more memories fromthis period, resulting in an early closure of their reminis-cence bump. The question that now arises what happenswith the patients’ identity development process whenthey start experiencing schizophrenic symptoms for thefirst time. Does identity development pause during thisperiod and recommence after a certain period when theystart receiving medical care? Future research shouldfocus on the seemingly uneven development of self-identity in patients with schizophrenia and how doesthat influence their memory recollection.
Effects of psychotic symptoms on AMA few studies have ascertained that psychotic symptomsrelate to certain AM characteristics among patients withschizophrenia. Studies revealed that negative psychoticsymptoms (i.e., social withdrawal; decreased or lostspeech; emotional response) were related to patients’AM specificity [42], self-defining memories [66], numberof memories recalled after diagnosis [85], elaborationusing fewer words [77], and negative symptoms, whichpredicted the poor quality of the narrative [46]. Sinceworking memory was found to be a predictor of negativesymptoms [122], a deficit in patients’ working memorymight have affected their capacity to reminisce abouttheir past.Additionally, positive psychotic symptoms (i.e., halluci-
nations and delusions) were found to be related to AMspecificity in one study [53]; however, the results werenot corroborated in other studies [51, 54]. Furthermore,Alle and colleagues [83] discovered that the symptoms
of illness were not related to self-continuity among out-patients (outpatients vs. inpatients appears to be an im-portant variable in this research, but the type of patientsamples are not clear in some studies). Also, positivesymptoms appear to be associated with poorer temporalconceptual connection and plausibility in patient narra-tives [45], perhaps due to their low capacity for realityevaluation which is associated with positive symptoms[123]. A recent study [88] found that patients with fewerpsychotic symptoms were likely to recall their memoriesfrom adolescence with more emotion and sensation.
Theoretical accountsThe second research question was what kind of theoret-ical accounts were employed to explain overgeneral AMin patients with schizophrenia. Several interpretationswere offered aligning with the SMS framework [14]. Pri-marily, patients’ overgeneral recall of AMs resembledGeneral Event or Lifetime Period Knowledge as stated inthe SMS. Issues such as abnormality in personal identity[40], disturbing self [47, 60], and unclear goals and in-tentions in patients with schizophrenia [47, 59] wereheld responsible for the less specific AMs. Impairmentsin executive function were also suggested to be respon-sible [44]. Although there was no explicit indication inany study currently reviewed, the goals of working self—according to the SMS of Conway and Pleydell-Pearce[20]—might play a key role in the lack of AM specificity.The recall of less specific AMs indicates that patient
goals of working self inhibit the construction of detailedmemories by sampling information from the autobio-graphical knowledge base. This inhibition could be dueto the discrepancy between the ideal self and actual self.There may be a large gap between knowledge of the pastactual self and the perception of the ideal self. The largerthe gap between selves, the more likely it is that a nega-tive feedback loop is created [14], resulting in memorysuppression or confabulation [17]. The discrepancy be-tween selves could be rooted in the developmental his-tory of patients with schizophrenia.We have observed that participating patients in the
reviewed studies accessed medical support at the time ofdata collection. Their psychotic symptom onset beganearlier, approximately in their late teens or early adult-hood [37, 39, 40, 65, 72, 124], a crucial period for adultidentity development [125]. A struggle with psychoticsymptoms at that time may have delayed the process ofidentity formation. Without proper support, training, orguidance, these individuals were not likely to functiondaily in work and relationships, causing a tendency tomisinterpret others. Hence, it is inevitable that their de-velopmental background, including a delay in adult iden-tity formation, contributed to their goals of working self,
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which are affected by a significant discrepancy betweenselves.The discrepancy between selves may results from the
cuing method too, especially when emotional word cueswere used to activate memories. The emotional wordsor pictures are more likely to induce discrepancy in par-ticipants’ current self and ideal self. Schoofs and col-leagues reported that cues create self-discrepancy,causing the retrieval of less specific AMs by functioningstudent participants [126]. Similar findings were re-ported among elderly people [127] as well as patientswith borderline personality disorder and depression[128]. There has been no study so far examining the re-lationship between self-discrepancy and overgeneral AMamong patients with schizophrenia. This could be afocus of future studies.Several studies suggested that people produce more
general than specific memories because they want tominimise their self-discrepancy [126–129]. It is proposedthat control of self-discrepancy is the nature of the goalsof working self [14, 17]. The control of self-discrepancyis quite similar to the concept of a protective mechan-ism, as depicted in the functional avoidance hypothesisof the CaR-FA-X model. The protective mechanismfunctions to reduce discomfort and intense emotion[15]. There has been evidence demonstrating that un-wanted memories might be directly suppressed, evencausing later forgetting [130–133] among healthy people.As a few researchers report [134, 135], sharing non-specific memories is a type of self-defense mechanismamong people with personality disorder. For example, inan extreme attempt to minimise the gap between selves,it is possible for patients to say: I cannot remember, or Ido not know, as their goals of working self guide them toescape a situation and maintain self-coherence.The CaR-FA-X model was used to explain less specific
AMs in patients with schizophrenia [12]. In the reviewedarticles, the executive function hypothesis was frequentlyemployed for this purpose. This hypothesis suggests thatto recall a specific and detailed AM, one has to initiateand conduct a conscious search within the autobio-graphical knowledge base which requires executivefunctions [14]. As the executive function is often im-paired in patients with schizophrenia, they show re-duced capability to construct specific AMs. Thecapture and rumination hypothesis was mentioned inonly two studies reviewed. According to the captureand rumination hypothesis, patients with schizophre-nia are often preoccupied with disorganised thoughtsor intrusive images, causing them a high level ofanxiety [136–138] or depression [138–140], whichmay take up a huge portion of their working memorycapacity; resulting in reduced cognitive resources toform specific AMs [15]. The functional avoidance
hypothesis did not receive any support from the studieswe have reviewed.Since the working self is crucial in the retrieval of AM
and is incrementally shaped through the developmentalprocess, examining patients’ upbringing would informresearch by providing a better understanding of patients’working selves. Although studies reviewed in this paperclearly show patients retrieving incoherent AMs, there isa dearth of evidence for the connection between cuesdispensed and elicited memories. There is a potentialgap between how patients and researchers make sense ofpatients’ reported memories; content labelled as uninter-pretable may result from researchers’ judgments orperceptions.Future research concerning AM in patients with
schizophrenia could investigate their developmentalstages, AM content, and sense making, particularly re-garding their past. To attain these objectives, the life-story-interview method over the cue-word methodseems better suited. Although the cuing method hassome methodological advantages (e.g., consistency acrossparticipants), the life-story method can offer completepatient life narratives and highlight the most importantinfluences, experiences, circumstances, issues, themes,and lessons of a lifetime [141, 142]. To ascertain how pa-tients with schizophrenia make sense of their life andconstruct personal meaning and reality, the life storyinterview method is quite useful [143, 144]. This methodis better able to show how patients organise, interpret,and create meaning from their life experiences, and howthey maintain a sense of continuity.
Memory enhancement in patientsSeveral studies have reported that patients’ memory spe-cificity and coherence could be improved through struc-tured interview protocols with specific cues, cognitivetraining, and rehabilitation [45, 54, 68, 74, 75, 81]. Inter-estingly, the memory coherence was only improved inpatients who had at least a moderate level of insight[41]. When the interviewers asked very specific ques-tions or presented with a specific cue, the patients wereable to recall further detail of their life experiences.However, it is not made clear in the current studies ifthis memory enhancement was resulted from the cue it-self or the process was moderated by a third factor, suchas patients’ ToM. When more specific questions wereasked, patients were able to realise what the interviewer’sexpectation was; therefore, produced additional detail oftheir experiences. Future research should investigate therole of ToM regarding patients’ capability of recallingAMs. Various training and therapeutic interventionshelp to improve patients’ AM specificity, but the under-lying cognitive processes deserve further examination. Itis critical to understand if these interventions improve
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the patients’ self-perception and reduce their self-discrepancy, therefore positively affecting their memoryrecall.
Strength/limitationsThis systematic review has incorporated all the most re-cent empirical research on the AM of patients withschizophrenia. Unlike previous reviews, it has revealedthat memory activation method itself plays a critical rolein whether an individual would recall a specific or over-general AM. This review highlights how the SMS frame-work could explain overgeneral and incoherent AMs ofpatients with schizophrenia. This review has, however, afew limitations. It only included quantitative studies. Re-sults from both qualitative and quantitative studiesshould be analysed for a more comprehensive under-standing of the AM of people with schizophrenia. An-other limitation is that some studies involved onlyoutpatients, some only inpatients, and others utilisedboth. Even some studies did not clearly mention the typeof patients they involved in their studies. Additionally,the patients participating in the reviewed studies were atdifferent stages of recovery because they were all under-going treatment. These factors may have affected the re-sults reported.
Directions for future researchBased on the reviewed research and extracted results, weoffer some specific guidelines for future research. First,to see how patients with schizophrenia organise theirpast autobiographical knowledge, researchers could util-ise the life chapters approach. This method has beenused to investigate how patients suffering from majordepressive disorder organise autobiographical knowledgewithin their past and potential future life chapters [145].Future researchers could ask their patients with schizo-phrenia to list their past and future life chapters in ameaningful way (e.g., college education, job with HSBC)and sort a given list of positive and negative attributesaccording to those chapters. It would be interesting tosee if the patients delineate their life chapters with morenegative than positive attributes compared to healthycontrols, and if there are any differences between attri-butes picked for their past and future life chapters. Thiskind of research could shed light on aspects of pastknowledge that are associated with schizophrenic symp-toms. Second, future studies could compare AMs of in-patients and those at different stages of recovery. Third,it would be interesting to see how AM relates to othercognitive processes (e.g., rumination, avoidance, problemsolving) in this population and how AM problems con-tribute to and maintain symptoms.Finally, we suggest cross-cultural research on AM in
psychosis as previous research has shown that
functioning individuals representing either collectivist orindividualistic cultures report AMs differently [146, 147].We also recommend future research on memory train-ing approaches and mechanisms of change in emotionsand symptoms. Some longitudinal studies could be con-ducted, as there are few such studies on patients withschizophrenia. It would also be interesting to comparecontent and appraisals of memories produced by pa-tients with schizophrenia. We strongly recommend re-search investigating life scripts produced by thispopulation and a comparison of their life scripts withthe cultural life scripts of healthy controls.
ConclusionThis review, following the PRISMA Statement guide-lines, synthesised empirical findings published in 57 arti-cles examining AMs in patients with schizophrenia. Thefeatures and content of AM, memory activation method,lifespan distribution of patients’ memories, and relatedaspects have been discussed. This review illustrates thatmost studies accumulated AMs through the generativeretrieval process. Cuing methods such as words, pic-tures, life stages, and open-ended questions were used.Patients with schizophrenia were found to frequently re-call more overgeneral memories. The patients who werestill experiencing psychotic symptoms at the time of datacollection were more likely to produce incoherent mem-ories. While examining the lifespan distribution of spe-cific memories, it was found that patients recalled morespecific memories from childhood and recent years, butvery few from early adulthood, forming a U-shaped dis-tribution; however, this finding was not overwhelminglyconsistent. Moreover, a typical reminiscence bump wasfound, but the patients’ bump started earlier than thebump exhibited by healthy controls. While patients ex-hibited the bump for 15–19 years of age, the controls ex-hibited it for 20–24 years of age.The review indicates that patients’ AM specificity can
be improved through retrieval training or by employingstructured interview protocols with specific retrievalcues. Patients’ personal insights contributed to how theynarrate their life stories, as their insight impacted ontheir mood. The relationship between history of suicidalattempt, level of depression and AM specificity was notconclusive; likely to be influenced by a third variable,such as patients’ stage of recovery, and patient type (i.e.inpatients or outpatients). Directions for future researchto improve AM specificity in this clinical populationwere presented.To explain overgeneral AM in schizophrenia, eight ar-
ticles employed the SMS framework, three used the Car-FA-X model, and the rest did not use any theoretical ac-count. The discrepancy between selves, dysfunctionalworking memory, unclear goals and intentions, and
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weaker ToM among patients, was held responsible forovergeneral AM. The reduction in recall of specific AMsfrom early adulthood was attributed to the lack of cogni-tive processing of the events due to the emergence ofpsychotic features during that period. Due to disease on-set, events occurring during early adulthood were notprocessed to become integrated within the patients’ life-long narrative, thus they were poorly recalled. Therefore,the earlier reminiscence bump for typical AMs in pa-tients could be attributed to the early closure of theadult identity formation process.
AbbreviationsABME: Autobiographical Memory Enquiry; AM: Autobiographical Memory;AMI: Autobiographical Memory Interview; CaR-FA-X: Capture and Rumination,Functional Avoidance, and Impaired Executive Control; DSM: Diagnostic andStatistical Manual of Mental Disorders; E-AGI: Erweitertes AutobiographischesGedächtnisinterview; IAPS: International Affective Picture System;ICD: International Classification of Diseases; IPII: Indiana Psychiatric IllnessInterview; PRISMA: Preferred Reporting Items for Systematic Reviews andMeta-Analyses; PTSD: Post-traumatic Stress Disorder; SDMs: Self-definingmemories; SMS: Self-Memory System; ToM: Theory of Mind
AcknowledgementsThe authors acknowledge the School Research Office for providingcontinuous administrative support to Yujia Zhang when she has conductedthis systematic review.
Authors’ contributionsSH and YZ conceived the review and finalised the review plan. They alsoassessed the quality of the selected articles according to the PRISMAStatement guidelines. SH, YZ, SKK, and LJ were all involved in writing themanuscript. All authors read and approved the final manuscript.
Authors’ informationYujia Zhang is a clinical psychologist and currently conducting research forher PhD at Monash University Malaysia. Her PhD work focuses onautobiographical memories of individuals suffering from schizophreniaspectrum disorder.Sara Kuhn is a graduate student at the Department of Psychology, Universityof North Dakota, USA.Laura Jobson is Senior Lecturer in the School of Psychological Sciences andTurner Institute of Brain and Mental Health at Monash University, Australia.She is a clinical psychologist with research interests in autobiographicalmemory, depression, and PTSD.Shamsul Haque is Associate Professor in the Department of Psychology,Jeffrey Cheah School of Medicine and Health Sciences, Monash UniversityMalaysia. He has research interest in the construction of autobiographicalmemory in psychiatric patients.
FundingThe Department of Psychology at Jeffrey Cheah School of Medicine andHealth Sciences, Monash University Malaysia has offered the open accesspublication funding support. The funding body has no role in the design ofthe study and collection, analysis, and interpretation of data and in writingthe manuscript.
Availability of data and materialsData sharing is not applicable to this article as no datasets were generatedor analysed during the current study.
Ethics approval and consent to participate“Not applicable”.
Consent for publication“Not applicable”.
Competing interestsYujia Zhang is supported by a Higher Degree by Research Scholarship fromMonash University Malaysia.
Author details1Department of Psychology, Jeffrey Cheah School of Medicine and HealthSciences, Monash University Malaysia, Jalan Lagoon Selatan, 47500 BandarSunway, Selangor Darul Ehsan, Malaysia. 2Department of Psychology,University of North Dakota, Grand Forks, North Dakota, USA. 3Turner Instituteof Brain and Mental Health and School of Psychological Sciences, MonashUniversity, 18 Innovation Walk, Clayton Campus, Wellington Road,Melbourne, Melbourne, VIC 3800, Australia.
Received: 7 December 2018 Accepted: 27 October 2019
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