WICN Keynote Embedded
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Transcript of WICN Keynote Embedded
7/23/2019 WICN Keynote Embedded
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The Role of Colour in Object
Processing: Developing a
Cognitive Neuroscience Approach
Toby Lloyd!ones
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David "ernon
#a$uyo Na%abayashi
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& 'o( is infor)ation about object colour and
object shape co)bined in object
identification and )e)ory*
& +hat are the neural processes that
)ediate object colourshape binding*
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& Behavioural work: QJEP, 2003
Repetition pri)ing and colour transfor)ation fro)
study to test
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& Method
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,ti)uli sho(n
in study phase
,ti)uli sho(n
in test phase
,a)e-correct colour
Change-correct colour
Ne(-correct colour
.anana To)ato .roccoli
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,ti)uli sho(n
in study phase
,ti)uli sho(n
in test phase
.anana To)ato .roccoli
,a)e-incorrect colour
Change-incorrect colour
Ne( -incorrect colour
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/f colour transfor)ation reduces pri)ing then
colour is utili$ed by the syste) )ediating
perfor)ance
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Study trial
Na)ing0 Colouredobject Decision0
Rate objectcolour typicality
1e2g20 345not typical at all0 645highly typical78
9iation cross: ;<3)s
,ti)ulus: =ntil response or fied period 1e2g20 ;s8
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Test trial
9iation cross ;<3)s
.lan% screen <33)s
,ti)ulus: =ntil response or fied period
1e2g20<33)s8
Response: Na)ing or Colouredobject Decision
%ey press 5Correctly or incorrectly coloured*7
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& Results
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Na)ing no effect of colour transfor)ation on
pri)ing
COD > (hen colour (as )ade relevant to the tas%
at retrieval0 colour transfor)ation reduced
pri)ing
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?2 Object pri)ing is not sensitive to shape alone0
nor does pri)ing facilitate everything that is
encountered
;2 Pri)ing is sensitive to the tas% at hand the
underlying )echanis) is selective and useful fordifferentiating ite)s in ter)s of their current
i)portance
& Co!lusios
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@2 ffects of colour on )e)ory are )ediated by a
for) of 5ne(>association pri)ing7: colour and
shape are bound together in a novel
representation (hich benefits perfor)ance
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& Patiet work: "l#hei$er%s disease
&euro'sy!holo(y, 200)
Older adults and AD patients (ill have preserved shapebased )e)ory0 but AD patients )ay not be able tointegrate shape and colour into a novel representation(hich can also benefit )e)ory
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Patiet dia(osis& AD inclusion > progressive decline0 i)paired
episodic )e)ory 1< or less on CRAD +ord List
Recall80 i)paired in ? other area
& 'C inclusion > BB, ; or greater0 or greater
CRAD +ord List Recall
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Patiet !hara!teristi!s
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Re!o(itio $e$ory
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& Results
Older adult controls
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Al$hei)er7s patients
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?2 Older adult controls de)onstrate ne(
association pri)ing
;2 AD patients have preserved shapebased
)e)ory0 but an attentional deficit )ay not allo(
shape and colour to be integrated to for) anovel representation (hich can also benefit
)e)ory
& Co!lusios
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& Behavioural work: QJEP, i 'ress
=nderstanding the nature of colourshape binding:
Dissociating binding in )e)ory fro) binding in
online identification
,a)e paradig): pri)ing vs2 baseline perfor)ance,tudy colour rating tas%
Test colouredobject decision
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S'atial se'aratio o* sha'e ad !olour
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& Predi!tios
?2 Reduced pri)ing for transfor)ed sti)uli0
de)onstrating that colour is nor)ally utilisedby the syste) )ediating perfor)ance
;2 /f ne(association pri)ing benefits )e)ory0
then (e epect euivalent pri)ing forcorrectly-incorrectly coloured objects andspatially integrated-separated conditions
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@2 9or object identification0 epect )ore efficient
processing of correctly coloured co)pared to
incorrectly coloured objects but only under
spatially integrated conditions
E2 F/f the sa)e )echanis) )ediates effects of
colour in online identification and pri)ing then
epect si)ilar effects of colour but only under
spatially integrated conditions
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& Results
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& Mai *idi(s
?2 Transfor)ing the colour of an object reduced
pri)ing0 therefore colour infor)ation nor)allycontributes to longter) )e)ory in this tas%
;2 The use of colour infor)ation in object )e)ory
did not depend upon colour falling on the
object surface
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@2 The use of colour infor)ation in object )e)ory
(as not influenced by the nature of the object
1i2e20 correctly-incorrectly coloured8
E2 +e observed independent effects of colour:
perfor)ance (as )ore efficient for correctly as
co)pared (ith incorrectly coloured objects but
only (hen colour fell on the object surface
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& Co!lusios
Two $e!hais$s o* sha'e+!olour idi(
-. E**e!ts o* !olour o o/e!t $e$ory are$ediated y ew+asso!iatio 'ri$i(
2. E**e!ts o* !olour o o/e!t ideti*i!atio are$ediated y a i'ut re'resetatio whi!h!o$ies o/e!t sha'e ad asso!iated !olour
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A and . contribute to online processing during objectidentification
C benefits object )e)ory assessed via pri)ing
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& fBR/ study: +iggett0 !ohnson0 Lee%
1.angor8 Reppa 1,(ansea8
E**e!ts o* !olour o o/e!t $e$ory MT1
E**e!ts o* !olour o o/e!t ideti*i!atio etral
te$'oral !orte4le*t *usi*or$ (yrus
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• Bethod
,tudy and test tas%s G a series of si)ple
bloc%eddesign eperi)ents as localisers
1LOC0 correctly-incorrectly coloured objects0
fa)iliar-novel objects8
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& RP study: 9ouuet0 .urgess 1,(ansea8
Bore pronounced positivity for repeated sti)uli
relative to ne( sti)uli starting around @33)s
after sti)ulus onset 1)ainly over posterior
electrodes8
An attenuation of the repetition positivity for
transfor)ed relative to untransfor)ed sti)uli
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Than% you