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Language and Cognitionin Development
SteIIa Christie and Dedre Gentner
lntroduction
The hypothesis that language can influencethought - generally known as the Whorfianhypothesis - has inspired strong opinionsin both directions. Early enthusiasm in ther95os and r96os was followed by decadesof disregard or worse. Now the wheel hasturned again, and the question of whetherand how language might influence cognitionis openly tested and debated. [See Gentnerand Goldin-Meadow, zoo3 and Gumperzand Levinson, 1996 for discussions of theforces behind this evolution.) However,work on language and thought remainsextremely contentious, and many of theclaims reviewed here are under challenge.
In some important ways, the field of cog-nitive development has been relatively opento the idea that language influences thought.Within adult cognitive psychology, the lnn-guage and thought hypothesis is associatedprimarily with Benjamin Lee Whorf and hismento4, Edward Sapir (e.g., Whor{ 1956),who proposed that specific properties of alanguage's grammar and lexicon could influ-ence cognition in speakers of that language:
"We dissect nature along lines laid down byour native language," fWhor{ ry56, p. n7).But in developmental theory the figuremost associated with the view that languageinfluences thought is Russian psycholo-gist Lev Vygotsky $962). Unlike Piaget, forwhom conceptual development proceededvia interactions with experiencg with lan-guage serving only as a means of communi-cation, Vygotsky saw language and cultureas critical to the development of thought.One could say that Piaget viewed the childas a tiny scientist, whereas Vygotsky viewedthe child as a cultural apprentice.
Vygotsky's view on the effects of lan-guage differed from that of Whorf andSapir. Rather than focusing on the effect$'of speaking one language versus another,Vygotsky theorized about the effects of lan-guage as such. He proposed that the inter-nalization of language provides childrenwith the means to direct their own thought:to achieve focused attention and will, and ameans of introspecting about one's own cog-nition. Vygotsky offered a yiew of languageas providing scaffolding for new concepts;he suggested that hearing a new term or a
6st
Christie, S. & Gentner, D. (2012). Language and cognition in development. In M. M. Spivey, K. McRae, & M. Joanisse (Eds.) The Cambridge Handbook of Psycholinguistics. Cambridge: Cambridge University Press, pp 653-673.
6s+ GENTNER AND CHRISTIE
new assertion, even when the child has poorinitial understanding, might both invite andguide the chlld to future learning.
Advances in cognitive psychology, lin-guistics, and linguistic anthropology haveled to progress on some classic questions.For example, a perennial question in thedevelopment of language and thought iswhich comes first - the concept or the lin-guistic term. Scholars like Bowerman (r98r;r9B9J have long raised challenges to thestanding Zeitgeist that concepts come first,with language merely naming them. Butuntil recently there was no way to addressthis directly. With the recent explosion oftechniques for studying infant cognition, itis becoming possible to address the ques-tion of whether and how prelinguistic cog-nition differs from postlinguistic cognition.As another example, comparative stud-ies of apes and young humans are anothernew source of insight. But this recent pro-gress has also made it clear that the ques-tion of whether language influences thoughtneeds to be decomposed into more specificquestions.
A set of fine-grained questions hasemerged concerning when and how lan-guage effects might occur [Gentner andGoldin-Meadow, 2oo3; Gumperz andLevinson, 1996; Wolff and Holmes, zou).Taking linguistic determinism - the hypoth-esis that the language we speak determineshow we perceive the world - as the start-ing point, one way to delimit the hypothesisis to specify whm we should expect to seeeffects of language on cognition. This wasthe move that Slobin (1996; zoo3) made inhis influential thinking for speahing hypoth-esis, which holds that language influencesthought only when language is activelyused. The initial statement was couched interms of "when actually speaking," but laterresearch has broadened the scope to includecomprehending language and perhapseven using language internally (though thismove makes the thinking-for-speaking viewharder to distinguish from linguistic deter-minismJ. Another way to delimit the ef[ectsof language is to assume that language aug-ments, but does not replacg other ways of
construing the world. This is the route takenby the Language as tool bit view - that acquir-ing a language provides new representationalresources - including new relational schemasas well as new categories - that augmentour capacity for encoding and reasoning
[Gentne4 2oo], 2oro; Gentner and Christie,zoro; Loewenstein and Gentneq, 2oo5; seeFrank et al., zoo9, for a similar view). Theselinguistically inspired representations maybecome habitual, so that they are readilyaccessible even without the internal use oflanguage fHunt and Agnoli, r99t; Levinson,et al., zooz; Lucy, rg9 4) . In this view, lan guageprovides tools that facilitate forming andusing particular representations - represen-tations that may be intellectually potent -
but does not replace all other encodingformats. Another distinction that needs tobe made is that between effects of languageon thought, and effects of language on lan-guage [Gleitman and Papafragou, zoo5). Forexample, the difference between the nam-ing patterns of English versus Japanese chil-dren for substances and objects, as in Imaiand Gentner's IISSZ) work, does not entitlethe conclusion that Japanese and Englishspeakers think about objects and substancesdifferently, though it does set the stage forfurther investigation [e.g., Imai and Mazuka,zoo1).
The distinctions among these views makeit clear that the language and thought issueis far subtler than the extreme version of theWhorfian hypothesis: that language acts todetermine our perception of the world - asa kind of permanent lens on the mind's eye.
From this perspective, the developmentalcourse oflanguage effects is ofcentral inter-est. In this paper we review evidence thatlanguage acts during cognitive developmentto promote certain kinds of conceptual struc-tures. In terms of the toolkit hypothesis, thequestion we ask is when and how languagefacilitates the acquisition of cognitive tools.Our discussion is organized around threedomains of active research: space, number,and theory of mind. There are other arenasthat could be discussed, including temporalrelations [e.g., Boroditsky, zoor), noun learn-ing and object individuation (e.g., Lupyan
LANGUAGE AND COGNITION IN DEVELOPMENT 6ss
et al., zooT; Xu, zooz), and object categori-zatron [e.g., Markman, 1989; Waxman, zooz;Waxman and Markow, t995), but given thelimitations of space we prefer to go deeplyinto a few areas.
r Space
The domain of space is an obvious place
to investigate the question of whether lan-guage affects cognition, for several reasons.First, spatial information is universally avail-able to humans regardless of where they
live. Indeed, we are all constrained by thesame universal laws of physics: An appleplaced in a bowl always rests on the bot-tom of the bowl rather than floating in midair within the bowl. Second, it is compara-tively easy to construct nonlinguistic situa-tions and events to which people can reactregardless of their language fHere spatialconcepts contrast with, say, counterfactualreasoning or concepts of justice.) Third,spatial knowledge is of fundamental impor-tance in human reasoning, both directly inactivities like navigation and manipulation,and tlrrough spatial analogies and meta-phors, which occur commonly in humanlanguage and thought. Finally, a prerequi-site for finding language-driven variabilityin concepts is variability in the language,and here space is an ideal domain. Recentresearch has revealed an astonishing varietyof ways in which languages have categorizedspatial configurations [e.g., Bohnemeyer andBrown, zooT; Bowerman, 1989, 1996; Brown,1994; Levinson and Brown, 1994; Casad andLangackel, 1985; Talmy, ry75, ry85). For allthese reasons, space has become an espe-cially active arena of investigation forlanguage and thought. The relational infor-mation that constitutes a given spatial con-figuration can be partitioned differentlyby different minds and different languages
[Gentner, rg8z). For example, one can thinkof an apple in a bowl as being supported bythe bottom of the bowl, or as being con-tained inside the bowl, or as in loose contactwith the bowl. A11 of these possibilities arereflected across human languages.
tr Ftamcs of rcfercnre
Spatial relational terms provide framingstructures for the encoding of events andexperience. Across a range of languages,
Levinson and his colleagues have identified
three spatial frames of reference that speak-
ers use to describe the location of an object(Levinson, 1996; Levinson et al., zooz). The
relative (or egocentric) frame describes loca-
tions relative to the speakeq, as in "the chair
is left of the table." The intrinsic (or obiect-centered) frame describes locations relativeto a landmark object, as in "the chair is infront of the fireplace." Finally the absolute(or geocentic) frame describes locations rel-ative to a global frame, as in "the chair is inthe northwest corner." The term allocentricrefers to both object-centered and geocen-tric frames, in contrast to egocentric frames.Languages may use more than one of theseframes, but in many cases one frame is dom-inant. In particulal, when discussing close-range locations, the egocentric frame isdominant in English, Dutch, and German,while the geocentric frame predominatesin many other languages, including Tzeltal(MexicoJ, Arrernte fAustralia), and Haillom(Namibia) [see Majid et al., zoo4 for a com-prehensive review).
The question here is whether the habit-ual use of a particular linguistic frame ofreference has any more general effect onspatial cognition. Research by Levinson andcolleagues (Levinson, tgg6, zoo3; Levinsonand Brown, ry94; Levinson et a7., zooz;Pederson, rg95J suggests that the answer isyes; they find that people are influenced bytheir language's dominant frame of refer-ence even when carrying out a nonlinguis-tic spatial task, such as copying a scene brtracing a path through a maze fMajid et al.,zoo4;butsee Li and Gleitman, zooz for a dis-senting view).
How do such effects arise in cognitivedevelopment? Do we begin life with natu-ral proclivities or instead as "blank slates" onwhich language, culture, and other experi-ences impose spatial framesT This questionis diffrcult to answer for a topic like frameof reference, because very young infants are
6s6 GENTNER AND CHRISTIE
HIDING FINDING
I
&
E = EgocentricO = Ob.iect-centeredG = Geocentric
. " - ; ; ; : , ; ; ; . ; ; " ; " " " ' .
- =l = '='ele
=;l= -
Figure 33.r. Experimental setup for an example trial in Haun et al.,
zoo6. Ten identical cups were placed on trvo tables [five cups on
each tableJ. The participant watched while a target was hldden
under the cup depicted as white (HIDINGJ. Then participants
moved to the other table and indicated where they thought a
second target might be hidden IFINDINGJ.
limited in their response capabilities, whileolder infants and toddlers may already beinfluenced by culture and language. ThePiagetian tradition holds that there is an ini-tial egocentric bias and a shift from egocen-tric to allocentric over development [Piagetand Inhelder, ry67; Pick, 1993), althoughthere is also some evidence for flexibility ininfants fAcredolg r97B; Bremner, r97B).
Haun et a1., [zoo6) addressed this in aset of studies that combines cross-linguisticdevelopmental comparisons with cross-species comparisons between humans andour close relatives, the great apes. For thecross-linguistic comparison, Haun et al.compared Dutch speakers, whose language
[like EnglishJ primarily uses an egocentricframe of reference, with speakers of Haillom
[a Khoisan language spoken in Namibia),which primarily uses a geocentric frame.Haun et al. used two-dimensional arraysof five objects, which allowed them to dis-tinguish the three frames of reference [seeFigure 33.r).
Participants faced an array of five identi-ca1 cups on Table r and watched as an objectwas hidden in one of the cups. They then
moved around to Table z, whereidentical array of cups, but from,site direction. Their task was tohidden object. So far this task,:prior frame of reference tasls;salutary innovation in thiswhereas prior research hadspeakers' preference for usingt'or another, this research utilizedtask, allowing the researcher$participants' facility in learniframe over another. Particiten consecutive trials in whictl'answer required use of thethen fwithout any break) tengeocentric frame, then ten using;it
centered frame. This techniqrle.:
whether people find it easier to
tial task when it is set in the
ence dominant in their language;paralleled prior findings of Iin adults: Dutch-speakingto-ten-year-olds were more
egocentric condition than in
while Haillom-sPeaking adultswere most accurate in the geoc
tion. The striking difference
LANGUAGE AND COGNITION IN DEVELOPMENT
is just what would be Predicteddominant frame of reference of
ive languages. [Of coursg these
could have stemmed from other.ior environmental differences; but
et al. [zoo4) for arguments against
et al. then went on to Probe theof frame of reference and to
it develops. Their studies built onresearch of Ca1l and Tomasello
;Tomasello and Call, 1997) com-
man patterns with those of our
:i.usins among the great apes. They, apes [three orangutans, two
ree bonobos, and five chimpan-four-to-five-year-old German-
,children a simplified search task.'saw an obiect hidden under
line of three identical cups on
l,.As in the prior study, they thenround to Table z, where theyr identical array from the oppo-
and looked for the hiddenbefore, participants had to dis-rule that determined the correct
ron Table z. There were two con-i,ggocentric, where the hiding and
maintained the same position
iio the participants' view point [left; and allacentric, where the hiding
f!1rg cups maintained the same posi-tiVe to an external frame. (In this
task, we can distinguish betweenand allocentric responding, but
the two kinds of allocentricbecause the geocentric (e.g., the
) and object-centered [e.g., theto the experimenter) frames
the same response.) The resultsgreat apes performed best in
condition, consistent withshowing that many species use
spatial information to navigate[, rggo). But what is more sur-
that German-speaking children
German (and also English) use basicallysystem of spatial reference, with the ego-atiirl reference frame as dominant.
showed the same allocentric pattern; theirperformance resembled that of our simiancousins rather than that of older Germanspeakers. As Haun et al. note, this suggestsa deep continuity between humans and thegreat apes in their native cognitive biaseswith respect to reference frame.
This finding of an allocentric prefer-ence in four-year-olds dovetails with evi-dence that infants can adopt allocentric aswell as egocentric frames (Acredolo, 1978;Bremner, r 978) . At the same time, this cross-species allocentric bias in young humansand great apes renders the later cross-lin-guistic divergence all the more striking. Byeight years of age, children whose languagefavors an egocentric frame have divergedfrom their native pattern and now find theegocentric frame easier to use, while thosewhose language is geocentric show a corre-spondingly geocentric bias. Important, thisentrainment by language is not absolute.For example, older Dutch children andadults performed above chance in the geo-centric condition, and as Li and Gleitman
[zooz) note, speakers of a given languageare also influenced by contextual factors
fsee also Gleitman and Papafragou, zoo5).Nonetheless, the fact that each group per-formed better on the frame favored by theirlanguage is evidence for effects of habituallanguage on the way we most readily con-ceptualize space.
tz The setnantics of containment andsupport
Within cognitive development, Bowerman
[r98o; r9B9) was among the first to challengethe idea that concepts come first in humandevelopment and are simply mapped ontolanguage. Noting the variability between lan-guages in how spatial relations are lexicalized(e.g., Bowerman, r98r; 1996; Bowerman andChoi, zoo3; Bowerman and Levinson, 2oouLevinson et al., zooz), Bowerman arguedagainst the common assumption that cer-tain words are acquired eadier than othersbecause they correspond to preexisting con-ceptual categories. Instead, she suggested
6sl
6r8 GENTNER AND CHRISTIE
that concept learning might be guided by
language from the start.'One striking example of such semantic
diversity is the contrast between Korean and
English spatial terms first documented by
Choi and Bowerman (r99r). In English, spa-
tial attachment is divided into semantic cat-
egories of containment and support (in and
on). ln contrast, Korean speakers organize
spatial attachments accor&ng to how the
two objects fit with one anothe4 contrast-
ing tight fit with loose fit. In English, putting
a videocassette in Lts case or an apple in a
bowl are both categorized as containment.However, Korean uses two different verbs: a
videocassette/case event is described by the
verb bbita [roughly, to join things tightly),
and the apple/bowl event is described by
the verb nehta (to join things looselyJ. Inthe other direction, the English distinctionbetween containment and support is notlexicalized in Korean: for example, the sameverb (kbita) is used for putting the top on apen and for putting an earplug into an ear
[Choi and Bowerman, r99r).If children form particular spatial con-
cepts that are then mapped onto language,then we would expect an advantage forwhichever,language best matches children'snatural concepts. But in fact, Choi andBowerman found that English and Koreanchildren acquired their very different spatialsystems at about the same rate. In both lan-guages/ the first relational terms appeared atabout fourteen to sixteen months. In Englishthese early relational words were down, out,on, off, andopen,with come,faII,walk,run, sit,and ridc by seventeen to eighteen months.In Korean the early terms were bhlta {fit),p p ayta (unfit), y eba [op en), and t att a [closeJ,with kata (go), ancta (sit), pwuthita Quxta-pose two surfaces), hka(b)ta [peel off), etc.,by seventeen to eighteen months. There aresome commonalities: Young children like totalk about opening and closing and about
z Bowerman's recent research has also explored theother direction: that some categories are more nat-ural than others and that trhese categodes will both
be more frequent in the world's languages and morereadily learned by children (the typological preua-Ience hypothesis) (Gentner and Bowerman, zoog).
moving around. But although both groups
talk about spatial relations, they pick out
very different parts of the spatial wodd to
lexicalize, and this selection is guided by
their language.Further work has explored the early
effects of language: that is, at what point
do infants begin to form different semantic
categories corresponding to their linguis-
tic terms? Choi et "1.
ftqqq) found that as
eady as eighteen months, infants are sensi-
tive to language-specific spatial categories.
In this study, upon hearing the spatial term
in, English-speaking children selectively
attended to scenes depicting containment(matching scene) as opposed to nonmatch-
ing scenes. Similarly, Korean-speaking chil-
dren attend to scenes depicting tight-fit
relations upon hearing hklta. During con-
trol trials, where the children did not hear
the target word (in for English or hhita for
Korean), there was no preference for either
the matching or nonmatching scenes, sug-gesting the absence of nonlinguistic biases.
Choi et al. used a variety of different spa-
tial scenes - e.g., for the containment rela-
tion (in), scenes included putting a peg in a
hole, Lego blocks in a box, books in box cov-
ers, and rings in a big basket. The fact that
eighteen-month-olds could correctly map
their respective linguistic spatial terms to
this variety of scenes suggests that they have
a generalized understanding ofthe contain-ment relation entailed by the spatial term.
Another line of support for the role of
spatial language in shaping spatial semantic
categories is a study by Casasola (zoo5), in
which eighteen-month-old English-speakinginfants formed an abstract category of sup-
port only when they heard the word on dur'
ing habituation triais. Infants in this study
were all habituated to four support events,
two depicting tight support and two depict-ing loose support. Infants then viewed four
test events in sequence: two depicting sup-port relation [familiar) and two depictingcontainment [a new relation). Infants whohad heard the spatial word on during habit-
uation looked longer at the novel relation
(containment) with both familrrar and novel
objects, indicating that they had formed an
absttioneralall cchartheyt o a
Tis irfornConin tlinfa:cate
[zocoldeithpairniecdistitharableiarizthegor)objeevel
Fyouoldfornmerloosuat(everexaltainwermerseqlconltainthatgor)evetloosmerwitl
7 Ale
LANGUAGE AND COGNITION IN DEVELOPMENT 6ss
abstract representation of the support rela-tion. In contrast, infants who had heard gen-eral phrases, novel words, or no words atall during habituation failed to notice thechange in relations even for familiar objects;they attended to a change in objects, but notto a change in relations.
These studies suggest that languageis instrumental in prompting infants toform stable spatial relaiional categories.Consistent with this claim, it appears thatin the absence of linguistic guidance, young
infants are ready to form a variety ofspatialcategories. McDonough, Choi, and Mandler(zoo 3J famili arized nine-to-fourteen-month-old English- or Korean-learning infants witheither pairs of tight containment events orpairs of loose containment events, accompa-nied only by music. Although the tight-loosedistinction is far more central in Koreanthan in English, both groups of infants wereable to extract the category during famil-iarization Both groups could distinguishthe familiar category from the new cate-gory when shown novel test pairs [with newobjects) consisting of a tight containmentevent and a loose containment event.3
Hespos and Spelke [zoo4) studied evenyounger infants and found that five-month-old English-speaking infants can readilyform either the English support/contain-ment distinction or the Korean tight fiVloose fit distinction. The infants were habit-uated either with a single tight containmentevent or with a loose containment event: forexamplg a cylinder entering another con-tainer that fit either tightly or loosely. Theywere then tested with both tight contain-ment and loose containment events (shownsequentially). Infants habituated to tightcontainment looked longer at the loose con-tainment event and vice versa, indicatingthat they had abstracted the respective cate-gory. More surprisingly, this pattern held upeven when infants had to transfer the tighVloose distinction from support to contain-ment. That is, when infants were habituatedwith either tight or loose support events, and
I A11 ages showed a familiarity preference in bothranguages.
then shown the tight containtnent and loose
containment test events, they looked longer
at the novel test event. This suggests that
five-month-old infants can form the Korean
tight-loose distinction, even when it cuts
across the English in/on disttnction.Lining up the developmental studies dis-
cussed so fa4 we have a rather perplexing
contrast. Five-month-olds showed sensitivityto the tight-loose distinction unmarked in
their native language in Hespos and Spelke's
[zood study. But in Casasola's [zoo5) study,which also used a habituation paradigm,
eighteen-month-olds failed to show sensitiv-ity to the support category which is markedin their language, unless they heard therequisite spatial term. We suggest that thisdifference may rely on the degree of gen-eralization that the infants needed to make(see also Casasola, zoo8J. In Casasola's study,the habituation events were quite varied andthe objects involved were perceptually richand differed across trials; in the Hespos andSpelke study, the habituation trials utilizedhighly similar events, both in the motionsinvolved and in the objects (which werevaried only slightly). Likewisg the test trialswere perceptually quite dissimilar from thehabituation trials in Casasola's study (espe'cially in the novel object trials) and percep-tually similar to the habituation trials inHespos and Spelke's study.
One might then ask "So which study isright? 'vVhen exactly do infants have thecategory of support?" We suggest that thisis the wrong question. Rather, the betterquestion is "When [and under what learningconditions) can infants form a category ofsupport at a given level of abstraction?" Ifwe consider that performance in these stud"ies derives in part from abstractions formedduring the study (rather than solely frompreexisting categories), then both kindsof study are informative. We can see the'sestudies as spanning a range. At one pole arestudies in which the intended relation is per-fectly aligned across exemplars with few dis-tracting surface differences (as exemplifiedin Hespos and Spelke's studies) - an idealsituation in which to form a generalization,albeit one that may not apply far beyond the
gs.
66o
initial stimuli. At the other pole are studies
with complex learning conditions, in which
the relation is instantiated over different
kinds of objects (as in the Casasola stud-
ies). That infants form the abstraction under
oeifect conditions tells us that this potential
is there prior to language; and indeed the
Hespos and Spelke results show that infants
are multipotential learners at this eady stage'
But the variable learning experience given
to the infants in the Casasola studies more
closely matches reallife learning conditions,
in which children encounter a given spatial
relation instantiated over a wide variety of
specific situations.+ From this perspective,
tlis range of studies from ideal abstraction
conditions to perceptually variable condi-
tions can be seen as putting bounds on the
conditions under which infants will form
the category.
t3 Rel"ational langaage and rclational
reptesent^tion
Gentner and colleagues have theorized
that spatial relational language - and rela-
tional language in general - can foster the
learning and retention of relational pat-
terns [Centn er, zoo3, zoro; Loewenstein and
Gentner, zoo5), thus acting as a "cognitive
toolkit." During initial learning, hearing
a relational term used for two situationsinvites children to compare them and
derive their common abstraction (symbolicjuxtapositionJ. Once learned, a relationalterm can help to stabil ize the abstraction.
Gentner fzoro) terme d this reification (see
also Lupyan, zoo8 for discussions of this
idea). The term can then be used to invite
a particular construal of a given situation -
one that may be advantageous for certain
o The McDonough et al. study also belongs on the"rich and varied" end of the continuum, with the
added important feature that they showed infantspairs of events (for example, two tight containment
events) during Familiarization. Their finding that
.,r"n tti.t"-rno.tth-old infants given pairs of events
can abstract common relations from rich, complex
stimuli is consistent with evidence that comparing
two exemplars fosters the abstraction of common-
alities, particularly common relations (Gentner and
Namy, 1999; Oakes and Riba1, zoo5).
purposes. One particularly powerful kind
of relational construal is a systematic tep-
resentation: one in which the lower-order
relations are interconnected by a higher-
order constraining relation. For example,
the set of terms top, middle, bottom form
a systematic structure governed by the
higher-order relation of monotonicity in
the vertical dimension. This kind of con-
nected relational system can be used to
support inference and, as discussed later
in this chapter, analogical mapping and
transfer.Recent evidence for the benefit of spa-
tial relational language - and especially of
systematic relational language - was offered
by Loewenstein and Gentner (zoo5) in a
spatial mapping study. Preschool children
saw two identical three-tiered boxes; they
watched an item being hidden in one box
and then searched for a similar item in the
corresponding location at the second box
(see Figure g.z). Chlldren's performance
was better when they first heard the box
described using spatial relational terms
such as on, in, under Fwther, when the
task was made more difficult by introduc-
ing a competing object match (a cross-map'ping, Gentner and Toupin, 1986), children
performed far better with the terms top,
middle, bottom (which convey a connected
system of relations) than with the terms
on, in, under, which lack a unifying higher-
order structure. We infer that heating top'
middle, bottom invited a representation ot
the monotonic relational structure of the
two boxes, and that this higher-order struc-
ture helped the children to achieve a rela-
tional mapping.Further evidence of the influence of spa-
tial relational language on spatial cogni-
tion comes from a study by Dessalegn and
Landau (zoo8). In this study, four-year-olds
were tested with a well-known problem in
vision: color and location conjunction (e.g.,
a split square, with red on the left and green
on the rightJ. Children were presented with
a target example [".g., " red (left)-green
frightJ square); their task was to find theexact match after a one second delay among
three choices: the correct match [red-green
GENTNER AND CHRISTIE
t :.:..ri,'t,.:i:,t
Figure 33.:versions oIspatial ma1experimenbox and se
squareJ, 1or the disquare). Idren hearis on thehearing s1potentiallcues fflasof the re,languagerather thrthe task.s
e Howevesuch as pmetaphc
*
LANGUAGE AND COGNITION IN DEVELOPMENT 66t
Neutral
Relational Match Only
Cross-Map
Relational Match withCompeting object Match
Figure 33.2. Experimental setup for the twoversions of the Loewenstein and Gentner [zoo5Jspatial mapping task. Children watched theexperimenter place the "winner" card in the leftbox and searched for it in the risht box.
square), the reflection (green-red square),or the distractor (red-green diagonal splitsquare). Performance was best when chil-dren heard relational language (e.g., "the redis on the left"J. Crucial, the advantage ofhearing spatial language was not found forpotentially salient nonlinguistic attentionalcues (flashing, pointing, or changes in sizeof the red part], suggesting that relationallanguage affected the spatial representationrather than simply increasing attention tothe task.t
I However, interestingiy, other asymmetric termssuch as prettier also aided performance - possibly viametaphor mapping to the actual spatial situation.
t.4 Habitual construals: Beyond thinking
for speahing
The studies reviewed so far suggest thatspatial language can influence children'sperformance on spatial tasks. Some of theseeffects couldbe explained bythe thinking for
speaking account. For example, Dessalegnand Landau's [zoo8) findings could beaccounted for by purely online, temporaryeffects of language. However, there are alsofindings that point to longer term effectsof language on the development of spatialrepresentations. For example, the effects oflanguage in the Loewenstein and Gentner
[zoo5J spatial mapping task were durable,not fleeting. When children were broughtback to the lab two days later to "play thesame game," those who had heard system-atic language (top, middle, bottom) outper-formed those who had not, even thoughthe spatial relational terms were neverused during the second session. These chil-dren were also able to transfer the mappingtask to new, rather different-looking boxes.These findings suggest that the relationalterms induced a corresponding represen-tation which delineated the internal struc-ture of the boxes. Finally, in a recent studyin Istanbul, Gentner et al. [zoo8) comparedfive-year-old children who possess normallanguage with a group of deaf children whohad not been taught a sign language, andwhose self-developed homesign gesturalsystem fGoldin-Meadow, zoo3) was defi-cient in spatial terms. Neither group wasgiven any spatial language during the task.Nonetheless, the hearing children (who hadgood command of Turkish spatial terms)performed significantly better on the taskthan did the deaf children.
' :There is also evidence from adult stud-
ies that language can become internalizgdand come to influence our default concep-tual construals, for instance the frame of ref-erence studies discussed earlier. Studies ofsupport relation provide another example:In contrast to infants, adults show a strongpreference for the categories enshrined intheir native language. McDonough et al.
[zoo3J gave adults an oddity task in which
GENTNER AND CHRISTIE
they had to say which of four events was
different from the others. English-speaking
adults could do this readily (seventy-eight
percent correct) when given three tight
containment events and one loose support
event; but when given three tight contain-
ment events and one loose containment
event [so that t]re choice had to be based
on the tight-loose distinction), only thirty-
eight percent chose successfully. In contrast,
Koreans ffor whom the tight-loose dis-
tinction is part of habitual languageJ read-
ily chose the odd item in this latter task
[eighty-percent correct). Likewise, Hespos
and Spelke [zoo4) found tlat in making sim-
ilarity judgments, English-speaking adults
were sensitive only to the Enghsh contain-
ment-support distinction, and not to the
Korean tight-loose distinction.This development from equipotentiality
in infants to linguistically biased similarity
in adults suggests that we possess an early
abillty to form a large number of potential
&stinctions. Habitual usage of language ren-
ders certain spatial categories more domi-
nant. This does not mean that adults cannot
learn a new spatial category under favor-
able learning conditions (e.g', Borodiaky,
Schmidt, and Phillips, 2oo3; Goldstone,
r99B); but it does mean that such learning
maybe difficult in ordinary life.Which rela-
tions become easy to notice appears strongly
influenced by the language we speak'
z Number
Mathematical structure seems so compel-ling that it must be an inevitable aspect
of human cognition. Dehaene (tggl, p.r1z) quotes French mathematician Chades
Heimite: "I believe that the numbers and
functions of analysis are not the arbitraryproduct of our spirits; I believe that they
exist outside of us with the same character
of necessity as the objects of objective real-
ity. .." Yet there is evidence that even simple
numerical insight is not inevitable and that
language plays a role in its development.We
begin by describing two possible precursors
of number concept, and then discuss how
their interactions with language may give
rise to number knowledge.TWo preverbal capacities that have been
implicated in accounts of number develop-
ment are the analog magnitude system and asystem for keeping track of small numbers of
items. The analog magnitude system is a sys-
tem shared broadly with other species that
allows approximate judgments of quantity.
It is what allows us [or a hamster) to choose
a larger pile of grain over a smaller pilg or
to notice that the amount of liquid in a con-
tainer has decreased. This skill operates over
even very large quantities, but its accuracy
is limited by Weber's Law: the discrimina-
bility between two amounts is a function
of their ratio. Thus, inaccuracies occur for
magnitudes that are very close. The analog
magnitude system is often modeled with
the accumulator model [Meck and Church,
19B5J.- The other relevant nonverbal capacity is
the ability to keep track of a small number
of items. This ability can be thought of as a
part of our general capacity for representing
mental models of the world; some accounts
(e.g., Carey, zoo4; Spelkg zooo) have also
[n[ed it with Pylyshyn's (zoor) notion of a
preattentive object file system' In contrast
io the analog magnitude system, the object
file system operates over discrete represen-
tations and is capacity limited to roughly
three or four objects.We will consider two main classes of the-
ories that assign a major role to language in
number development. One theory centers on
language as a link between modules,'while a
,e.ind b.oad class oftheories focuses on the
count system and other number terms as a
means of promoting numeric insight.
zt Langu^age as knhbetueen madubs
Spelke fzooo; zoo3) and her colleagues theo-
rize that language serves as a combinatorial
system that linls the two preverbal numeric
modules discussed above - the object file
and the analog magnitude system. Since nei-
ther of these two preverbal modules deals
with exaalarge numbers, the combinatorial
power of language is needed for the ability
LANGUAGE AND COGNITION IN DEVELOPMENT
rc.
r gi*:1}lri
r;i
'j:j
:1
:;
661
to represent exact large numbers. One lineof support for this theory comes from astudy with adult Russian-English bilinguals
fSpelke and Tsivkin, zoot), which showedeffects of language in the performance ofexact arithmetic calculations. Bilingual par-ticipants were trained in one language ontwo kinds of problems: exact calculationproblems and approximation problems.Participants were later tested in similarproblems in the other language. Spelke andTsivkin reasoned that iflanguage is necessaryfor representing exact large numbers, thenperformance in exact calculation problemsshould deteriorate. However, approximatecalculation skill should not be affected. Thisis indeed what they found: Bilinguals wereable to transfer the new approximation skillsacross languages, but not the exact calcula-tion skills.
z,z Numbet Innguage as cognitive toolbit
'While the view that language acts as a linkbetween modules recruits both the objectfile and the accumulator system, anotherview of how language learning supportsnumber development relies primarily on theobject file capacity (Carey, zoo4;Mix, zooz).These accounts recognize that knowledgeofthe count routine does not by itself con-fer an understanding of numbers, but holdthat learning the linguistic count sequenceis crucial in the development of numbers.The binding of the numbers words to car-dinal sets occurs slowly. A child may under-stand that one refers to an individual, butstill regard two, three, and so on as referringto undefined larger sets. Counting seems tobegin as a social routine, akin to a chant,and only later to become linked to cardinalnumbers (Fuson, rgBB; Wynn, r99o). A strik-ing demonstration of this lag is the fact thateven when a young child has just correctlycounted a set of objects ["one, twg three,four"), she typically cannot respond "four"to the question "So how many are there?"
This suggests an intriguing possibility:that the linguistic count routine serves asan analogy that invites children to orga-nize numerical quantities into an ordinal
sequence. This possibility ls most clearlyarticulated by Carey (zoo4; zoog) in herbootstrapping account fsee also Gentne4zoroJ. According to this account, childrenfirst learn the counting routine as a kindof gamg with no understanding of how itconnects to cardinal numbers. Gradually,the child learns to attach number words tovery small set sizes. The learning is at firstpiecemeal - even after binding two to sets ofcardinality twg weeks or months may ensuebefore the child realizes thatthree refers to aset with three items (Carey, zoo4;Mix, zooz;Mix, Sandhofe4 and Baroody, zoo5). Butonce a child reaches an understanding ofroughly three, or sometimes/our,the patternchanges. The child rapidly binds succeedingnumbers to their cardinalities, and showsunderstanding of the successor principle,that every (naturalJ number has a naturalsuccessor. This insight - "If number word Xrefers to a set with cardinal value n, the nextnumber word in the list refers to a set withcardinal value n + r" fCarey, zoo4) - occursvia an analogy between counting one furtherin the verbal count sequence and increasingby one in the set size.
But the analogy between the countingone
further in the count sequence and adding onein quantity is very abstract. As Mix [zooz;Mix et al., zoo5) documents, children's earlyinsights into how numbers connect to setsize are often concrete and context-specific.For example, in Mix's [zoozJ diary study,at twenty months Spencer spontaneouslybrought from another room exactly twotreats for the family's two dogs, and repeatedthis feat with perfect accuracy several timesover the next few weeks. But he failed whenasked to go get "train treats" for his twotoy trains, suggesting that his command of"twoness" was highly context-bound.
Mix and colleagues have noted severalkinds of early nonverbal experience thatcontribute to the gradual acquisition ofnumerical insight, including several kindsof routines that promote one-to-one cor-respondence (such as distributing candiesamong several peopleJ. They also suggestan important role for language in the devel-opment of cardinality: namely, that hearing
)e
66+ GENTNER AND CHRISTIE
tvvo sets labeled with the same count word
could prompt a comparison process that
leads the child to notice their common
number [Mix et al., zoo5). This line is con-
sistent with the idea that common language
invites comparison (Gentne4 zoo3; Gentner
and Namy, 1999; Loewenstein and Gentneq
zoo5) which in turn can support categortza-
tion [Gelman and Markman, r987;Waxman
and Klibanoff zooo).In opposition to the above proposals,
Gelman and Gallistel argue that language
has little if any role in the development of
number. In their account, the analog magni-
tude system is the cognitive foundation of
number knowledge [Dehaene, 1997; Gallistel
and Gelman, Lggz).Gallistel, Gelman, and
Cordes [zoo5) argue further that the analog
magnitude system, whose output is con-
tinuous rather than discrete, represents the
real numbers. As how to language may play
a role in number development, Gallistel and
Gelman posit that "[A] system for arith-
metic reasoning witJr real numbers evolved
before language evolved. When language
evolved, it picked out from the real numbers
only the integers..." [Gall istel et al., zoo5, p.
247).This position reverses the usual suppo-
sition of developmentalists and historians
that understanding of the natural numbers
appears first, followed by the integers, the
rationals, and the reals.
2.7 Research on la.nguages that lark fullcount systen$
One line of support for the hypothesis
that count terms are causally related to
the development of number knowledge
comes from studies of the Pirahd (Everett,
zoo5; Gordon, zoo4), an Amazonian tribal
group that uses what has been described as
a "one-two-many" system of counting [hdi,hoi, baagi lor aibail). (See also Pica et al',
zoot for similar results for the MundurukuJ.Gordon administered several numerical
tasks using objects familiar to the Pirahl,
over numbers between one and ten. For
example, the experimenter would place, say,
five batteries on the table, and ask the par-
ticioant to "make it the same" with another
set of batteries. In another task, some nuts
were put in a can, and then nuts were drawn
out of the can one by one by the experi-
menter. After each withdrawal, participants
were asked whether the can still contained
nuts or was empty. The results were strik-
ing. The Pirahd participants performed
with good accuracy for up to three items,
but performance became merely approxi-
mate after three items. Nevertheless, perfor-
mance beyond three was not random; it was
consistent with the Weber fraction found
in results of people performing magnitude
estimation tasks. The Pirahd have the same
ability to estimate numerosity as do English
or French speakers; what they lack is a ver-
bal counting system.Striklng as it is, this finding has been rep-
licated by a later study of the Pirah6 (Frank
et a1., zoo8). Frank et al. conducted the same
tasks as in Gordon's study and again found
only approximate performance for numbers
beyond three in tasls like the nuts-in-the-
can task [though this time the Piraha per-
formed better on the simpler versions of the
one-to-one matching task than they had in
Gordon's study). An additional linguistic
task administered by Frank et al. suggests
that the count system of the Pirahd is even
less precise than the previously suggested
one-two-many system. In a numeral elic-
itation task, speakers were shown a series
of either increasing ffrom one to ten) or
decreasing (from ten to one) objects, and
asked at each stage "how much/many arc
there?" While in the increasing elicitation
condition the word h6i was used only for
one item, in the decreasing condition the
same word was used for quantities as large
as six. It appears that the Pirahd terms are
not true n-umbers, but are relative to the
size of the set - something more like "a few,
more than a few, lots."
2.4 Effects of language onlater
deu elo pment o f math ematic s
If number words are indeed crucial in the
development of the number concept,- then
we milht see different developmenlal pat'
terns in number acquisition depending on
q
LANGUAGE AND COGNITION IN DEVELOPMENT 66s
the characteristics of number words in agiven language. Miller and Stigler (1987)suggest that one important difference isthe regularity of the number system. Theynoted that Chinese is more systematic thanEnglish in an important respect: Whereasboth languages have unique words for onethrough ten, Chinese is far more regularin its two-digit numbers than is Engfish. InChinese, eleven is "ten one," twelve is "tentwg" and so on throughout tJre teens, andthe system continues in this regular fashionwith "twenty-one," "t\,venty-twq" and so on.Contrast this system with English, in whicheleuen and twebe are opaque and althoughthirteen through nineteen are partly transpar-ent (ifthe child recognizes "teen" as "ten"), inaddition, the order oftens and units reversesafter twenty - we say twenty-one, twenty-two,and so on. Miller and Stigler hypothesizedthat a regular system like Chinese would beeasier to learn and use fsee also Fuson andKwon, r99z). Consistent with this predic-tion, they found that Chinese preschoolers(aged four and fiveJ were significantly bet-ter than their English-speaking peers in acounting task in which they had to count ashlgh as they could (Miller et a1., r995J. BothAmerican children [ninety-four percent)and Chinese children (ninety-two percent)could count to ten, but while seventy-fourpercent of Chinese children could count totwenty, only forty-eight percent ofAmericanchildren could do so.
What about the effects of linguistic vari-ability within a language - does the amountand quality of mathematical language influ-ence children's learning of that domain? Tofind out, Klibanoff et al. [zoo6) recordedthe kind of mathematical language used bypreschool or daycare teachers and relatedit to measures of the growth of children'sconventional mathematical knowledge overthe school year. They included language forordinality [e.g., "Point to the one that hasmore") and cardinality [e.g., "Point to fou4"given cards with varying numbers of itemsJ,as well as names for geometric shapes, theterm "half," and so on. The results showeddramatic differences in how much math-related talk teachers provided, and further,
that the amount of teachers' math-relatedtalk was significantly related to the growthof preschoolers' conventional mathematicalknowledge over the school year and unre-lated to their math knowledse at the start ofthe school year.
3 Theory of mind
Theory of mind refers to the ability to reasonabout mental states - beliefs, desires, inten-tions, and emotions. In large part, mentalstates are expressed via language, and hear-ing conversations about desires and inten-tions is one way of learning about others'mental states. But some researchers havetaken the link between language and theoryof mind further and have proposed that lan-guage plays a fundamental role in the devel-opment of theory of mind. Theories thatinvoke language differ as to which aspectsof language - whether pragmatics
"nd dir-
course structure, lexical semantics, or syn-tactic structure - are most fundamental fordeveloping a theory of mind.
A key question in the development oftheory of mind is how and when childrenbecome aware that other people's mindsmay not contain the same behefs as theirown mind. Performance on false belief tasksis one standard way of assessing whetherchildren have this understanding. Oneclassic false belief task, first introduced byWimmer and Perner (rg8lJ, is the unseendisplacement scenario. For example, three-to nine-year-old children are presentedwith a story in which Maxi puts his choc-olate in the kitchen cupboard. While Maxiis away, his mother moves the chocolate tothe drawer. Children are then asked whereMaxi will look for his chocolate when hereturns - in the cupboard or in the drawer.None of the three-year-olds correctly saidthat Maxi would look in tJre cupboard,whereas a majority of four-year-olds gavethe correct answer.
Another type of false belief task is the"smarties" study [Gopnik and Astington,r9B8; Perneq, Leekham, and Wimmet, tg87),which can be used to assess children's
666 GENTNER AND CHRISTIE
insight into their own minds. In this task,
the child is shown a smarties box (smarties
being a type of candy), and asked what is in
the box. The child readily answers "candy"
and is then allowed to look inside, where-
upon she discovers to her surprise that the
box actually contains crayons. When the
experimenter asls what the child originally
thought was in the box, five-year-olds cor-
rectly say "candy," but most three-year-olds
insist that they initially expected the candy
box to contain crayons; some even claim to
have said so out loud.Many results from theory of mind studies
suggest that the ability to represent people-'s
epistemic states does not become firmly-
established until around four to six years of
age.6 By this age, many cognitive and linguis-
tic skills are already quite advanced. Many
theorists emphasize the importance of these
skills without assigning language a special
role [e.g., Gopnik andWellman, r99z; Perner
t99t). Others have argued that it is theory-of
mind that precedes language, rather than the
reverse. In one version of this position, the-
ory of mind stems from an innately develop-
ing module [Baron-Cohen, 1999), which may
support children's understanding of mental
langrrage but does not require language for
its development. A weaker position is that
some degree of interpersonal insight - nota-
bly a sense of when joint attention is called
for - is critical for language development
[Baldwin, r99r; Tomaselo, 1998).However, a sizable body of research has
argued for a role of language in the devel-
opment of theory of mind. For examplg
Milligan, Astington, and Dack [zoo7) found
in a metaanalysis of ro4 false belief studies
for children under age seven that language
ability is a significant predictor of false belief
understanding even when age is controlled.
Overall, three major views have been pro-
posed for how language may contribute to
the development of theory of mind: the dis-
course pragmatic, the lexical semantic, and
6 However, some studies have found evidence of
an ability to represent at least some mental states
of others as ea.ly as fifteen months [Onishi and
Baillargeon, zoo5). How tiese early sensitivities
relate to later patterns remain to be worked out.
the complementation syntax view. Although
these three views are not mutually exclu-
sivg they make different bets as to which
aspect of language play a role in the devel-
opment of theory of mind'
7t Discourse Ptagmntk
In the discourse pragmatic account, conver-
sational pragmatics is critical in developing
an understanding of other minds [Harris,r999J. Children first become aware of their
own mental states, and through simulation
or role taking processes, they use this aware-
ness to infer the mental states of others'
Back-and-forth discourse allows children
to realize that they sometimes know what
others do not, and vice versa. One line of
support for this view comes from a correla-
tional study that showed that deaf children
who had more opportunities to participate
in rich discourse interactions with others
also performed better in false belief tasks
[Peterson and Siegal, zooo). In- another
study, Dunn et al. [r99r) observed natural-
istic conversations between two-year-olds
and their mothers. Seven months later, the
children were queried on the understanding
of other minds. They found that children's
engagement in family conversation about
f".1it g states was positively correlated with-
the ability to give.correct explanations of
false belief behaviors.
7.2 Lexical sem.antics
In the lexical semantics view, the acquisition
of mental state terms such as think., bnow,
andbelieue plays a crucial role in the devel-
opment of ihe understanding of false beliefs
[Astington, 1996; Bartsch andWellman, 1995;
Bretherton and Beeghly, r98z). Children
begin to use mental state terms at about age
two, especially perceptual and emotional
terms [see, hear;happy, sad, angry). Starting
at age ihree, children also begin to produce
.ognitiu. terms such as think, and hnow,but
it is not until the early school years that chil-
dren show clear discrimination among terms
such as think, know, and gtess [Bartsch and
Wellman, 1995; Bretherton and Beeghly,
.:!s'.1
i):LANGUAGE AND COGNITION IN DEVELOPMENT 662
r98z). The lexical hypothesis is that childrenacquire these mental state terms in con-versation; parents use them to refer to themental states that the child is experiencing,allowing the child to attach the terms to herown mental states. The child also noticesthat these terms can apply to other peo-ple, inviting the child to attribute the cor-responding mental states to others as well asto herself [Astington, 1996).
To test whether mothers' language influ-ences the development of theory of mind,RufFrnan, Slade, and Crowe fzooz) con-ducted a longitudinal study in which theyasked mothers to describe pictures to eighty-two children at three time points spanning aone-year period. They found that mothers'use of mental state utterances at eady timepoints was correlated with children's latertheory of mind understanding. The resultheld true even when a number of poten-tial intervening factors were accounted for,such as children's age, their language abil-ity, their own use of mental state languaggtheir earlier theory of mind understanding,and also mothers' education and other kindsof mothers' utterances. Ruffrnan et al. con-cluded that mothers' mental state utter-ances play a causal role in the developmentof theory of mind.
73 Compbmentation srytqx
Another prominentview is that acquiring thesyntax of sentential complements is a criti-cal factor in the development of false beliefunderstanding (de Villiers and de Villierqzooo). In a sentential complement construc-tion, a sentence takes a fuIl clause as its obiectcomplement: for example, "M"ry thinks ihatJohn is at home." This construction makes itrelatively transparent to see that the truthvalue of the sentence as a whole can differfrom that of the embedded proposition: thatis, the fact that Mary thtnhs that John is athome does not necessarily mean that Johnis at home. De Villiers and de Villiers notethat communication constructions such as "xsays that p" provide overt evidence for thisdisassociation when p is known to be untrue.In this way, communication verbs can serve
to bootstrap children's understanding of theuse of think: children learn to deal with falsecomplements via say, and by analogy cometo understand that think. too can take a falsecomplement.
One line of evidence for this hypoth-esis comes from a longitudinal study withpreschool children that found that perfor-mance on false belief tasks was predicted byperformance in interpreting sentences con-taining mental and communication verbswith complements [de Vlliers and Pyers,zoozJ. To gauge mastery of sentential com-plements, children were given scenarios likethe following: "She said she found a monsterunder her chair, but it was really the neigh-bor's dog" and then were asked "What didshe say?" Children's responses were countedcorrect as long as they said "a monster." Thechildren also carried out false belief taslasuch as the unseen displacement task andthe unexpected content task describedearlier. A positive correlation was foundbetween mastery of sentential complementsand success in false belieftasks.
Further evidence was found among oraldeaf children who are delayed in languagelearning (de Villiers and de Villiers, zoo3). Tocontrol for any effects of language requiredby the false belief tasls themselves, nonverbalfalse belief tasls were used. In one task, theexperimenter hid a sticker in one of the fouridentical boxes while a screen obscured thehiding from the child. On the test trial, two"helping" adults - one wearing a blindfoldand one who could see the hiding event -
each pointed to a box after the screen wasraised, and the child had to choose whoseadvice to follow. In the other task, childrenwere shown a sequence of pictures depict-ing an unexpected content event and had tocomplete the sequence with either a surpriseface fcorrect) or a neutral face. The perfor-mance of these children on false belief taskswas predicted by their performance in thecomplement comprehension task.
Most recently, Pyers and Senghas (zoo9)took advantage of a naturally occurringchange in the linguistic affordances ofan emerging language - Nicaraguan SignLanguage [NSL) - to test whether language
668 GENTNER AND CHRISTIE
promotes false belief understanding over and
above social experience. NSL first appeared
in the rgTos among deaf children entering
special education schools [Senghas, Kita,
and Ozyiirek, zoo4).When the roughly fifty
original children [who typically had devel-
oped their own idiosyncratic homesign ges-
ture systems; Goldin-Meadow, zoo3) were
brought together, they developed an eady
form of NSL as a common language. This
was further enriched by the second cohort
of children in the mid-rg8os. Senghas and
colleagues report that even today, the sec-
ond cohort exhibits a more developed form
of the language than the older first cohort(senghas and Coppola, zoor; Senghas et a1.,
zood. In particulal, the second cohort's lan-guage includes more mental state verbs than
the first cohort's version - setting the stage
for a test of whether possession of mental
state verbs supports reasoning about others'
mental states. Important, aside from their
language differences, the two cohorts have
similar histories of schooling and social
interaction.Pyers and Senghas used a low verbal false
belief task to test speakers from the two
cohorts of Nicaraguan signers: Participants
were given a sequence of pictures depict-
ing unseen displacement events [followinga false belief plotJ, and then had to choose
which oftwo final pictures correctly depictedthe final event. The results showed a strongeffect oflanguage: The second cohort (aver-
age age r7.5 years) by far outperformed the
first cohort [average age 26.8 years). Out of
four test trials, the second cohort solved on
average 3.5 trials, as contrasted with .5 trials
for the first cohort. Interesting, when testedtvvo years later, some of the first cohort who
had gainedmental state verbs also performed
better in the false belief task. Overall, theseresulG support the idea that language pro-
vides cognitive tools that support theory of
mind, even well into adulthood.
4 Summary
'vVhile the issues are far from resolved,the evidence reviewed here suggests that
language may influence the development
of conceptions of space, mind, and number.
Language can foster cognitive development
through various routes. The language wespeak provides us with tools for dissecting
space into finer categories, and for connect-
ing those concepts into systems that permit
combinatorial inferences. Language can also
invite a systematic representation [as in the
Chinese numerals, or in the fluent numeri-
cal abilities of English speakers as compared
to the Pirahi speakers). These representa-
tions can support real-world tasls such asnavigation and calculation. They also sup-port abstract thinking, such as using spa-
tial relations to reason about time, to plot
kinship relations, or to comprehend graphs
and other figures that use spatial patterns to
depict nonspatial phenomena.An interesting further question is: What
is the time course of this linguistic influ-
ence? The available research suggests that
language effects are not immediate. It is
not enough to simply learn a set of terms(even supposing that their full meanings
are understood - a dubious assumption in
early development). We suspect that some
degree of entrenchment must occur before
the new representation is sufficiently robust
to have cognitive effects. For example, in
the Loewenstein and Gentner [zoo5J spatial
mapping task, hearing spatial terms such
as top, middle , bottom improved the perfor-
mance of youngeq but not oldel, children.
Apparently, the younger children knew the
terms well enough to benefit from hearing
them, but not well enough to access them
spontaneously. The performance of the
older children is consistent with the possi-
bility that the spatial system conveyed by
the terms was suffrciently entrenched to
come to mind with or without the terms.
In some cases linguistic patterns may
give rise to a habitual mode of construal'
But in general, the evidence suggests that
the influence of language is far from abso-
lute. Human representation is rich and var-
ied, and no one system of encoding is able to
govern all of human representation. There
i, alro reason to believe that there is influ-
ence in the reverse direction, from cognition
LANGUAGE AND COGNITION IN DEVELOPMENT 66g
prevalence of a given semantic system
oss langrr"g.t may afford an estimate ofilbognltiu" naturalness and concomitant
iof learning.are many open questions. For
ap1e, in which semantic arenas do we
.the largest effects of language - arelarger effects of language in relatively
arenas, such as mathematics and
e, than in more concrete domains such
fu61or? Does language for emotions andthought processes influence the way in
we construe our own minds? Does
fng a technical language influence adult
oition in ways similar to the develop-
iial patterns discussed here? Addressingquestions will give us a deeper under-
of how language affects the devel-of thought.
L. P. (1978). Development of spatial ori-€ntation in infancy. D eueLtpmental Psycholo g,
224-34.J.W. [r996J. What is theoretical
the child's understandins of mind?Vygotskian view of its development. In
P. & Smith, P. K. [Eds.] Theoriestheories of mind (pp. I8+-SSJ. Cambridge
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