[Paleopsych] SW: Children and False Belief
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Mon Jun 6 17:59:19 UTC 2005
Cognitive Science: Children and False Belief
http://scienceweek.com/2005/sw050610-2.htm
The following points are made by J. Perner and T. Ruffman (Science
2005 308:214):
1) Although primates and other animals seem to have some understanding
of mind (that is, an understanding of the behavior of others), the
concept of belief seems to be a specifically human ability.
Comprehending false belief is the clearest sign of understanding a
critical aspect of the mind: its subjectivity and its susceptibility
to manipulation by information. It is thought that children develop an
understanding of false belief around 4 years of age. However, Onishi
and Baillargeon [1] report that infants as young as 15 months have
insight into whether a person acts on the basis of a mistaken view
(false belief) about the world. This discrepancy touches on important
issues. An understanding of false belief at 4 years of age suggests
that this ability may be constructed in a cultural process tied to
language acquisition. In contrast, competence at 15 months suggests
that this ability is part of our purely biological inheritance. What
could account for the discrepant findings?
2) Children's understanding of false belief has hitherto been assessed
using a verbal false-belief task in which the experimenter enacts
stories. An example of such a story is as follows: A protagonist
(let's call him Max) puts a toy or doll (object) in one location and
then doesn't see it moved to a second location [2]. When asked by the
experimenter, most 3-year-olds wrongly claim that Max will look for
the object in the second location (where they know it is). This
finding with 3-year-olds has been confirmed despite many attempts to
improve the potential shortcomings of the verbal false-belief task
[3]. These results contrast with those from Onishi and Baillargeon's
study in which 15-month-old infants were tested with a nonverbal
false-belief test.
3) In this test, infants were familiarized with an adult actor hiding
and then retrieving a toy (a plastic slice of water melon) in either a
yellow or a green box. The looking times of the infant subjects were
then computed in a series of trials that tested whether the actor held
a true or false belief about the location of the toy. Onishi and
Baillargeon found that the infants "expected" the actor to search for
the toy based on the actor's belief about its location, regardless of
whether the location was actually correct. So, why would 3-year-olds
fail to provide the correct answer in a verbal false-belief test, when
15-month-old infants can correctly anticipate erroneous actions in the
nonverbal false-belief test?
4) Part of the explanation might come from previous studies that used
eye gaze as a measure of understanding in 3-year-olds. Three-year-olds
look to the correct (initial) location when anticipating Max's return
there, even when they explicitly make the incorrect claim that Max
will go to the second location. This early indication of understanding
Max's mistake has been dubbed implicit, because many of these children
show no awareness of the knowledge implicitly conveyed in their
correct eye gaze (4). Nonetheless, children at the age of 2.5 years
show absolutely no sign of this earlier, implicit understanding (5).
Converging evidence comes from children's word learning, which also
shows sensitivity to false belief around 3 years and not before. In
sum, the evidence of an earlier, implicit understanding does not solve
but rather exacerbates the puzzle about Onishi and Baillargeon's
finding with infants: Where would the implicit understanding be hiding
between 15 months and 3 years?
5) By adopting particular assumptions about how infants encode events
and behavior, the authors (Perner and Ruffman) propose two
explanations for the apparent early competence of infants that imply
an evolutionary, innate bias for understanding the mind. Infants
encode events and behavior the way they do because this encoding
captures something useful about how people tend to act only because
people are endowed with minds. Yet there is no need to assume an
understanding on the infant's part that a mind mediates a particular
behavior.
References (abridged):
1. K. H. Onishi, R. Baillargeon, Science 308, 255 (2005)
2. H. Wimmer, J. Perner, Cognition 13, 103 (1983)
3. H. M. Wellman, D. Cross, J. Watson, Child Dev. 72, 655 (2001)
4. T. Ruffman, W. Garnham, A. Import, D. J. Connolly, J. Exp. Child
Psychol. 80, 201 (2001)
5. W. A. Clements, J. Perner, Cognit. Dev. 9, 377 (1994)
Science http://www.sciencemag.org
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