PS 210 Unit 2 cognitive development paper example

Where Will Maxi Look for the Chocolate? The Theory-Theory Account of Understanding Minds, Applied to Four-Year-Olds and Tested Against Infant Looking-Time Evidence

Student Name

Psychology, Herzing University

PS 210: Psychology of Child and Adolescence

Instructor Name

January 20, 2026

Where Will Maxi Look for the Chocolate? The Theory-Theory Account of Understanding Minds, Applied to Four-Year-Olds and Tested Against Infant Looking-Time Evidence

The Framework in Its Own Terms

This paper examines one account of how children come to understand other people's minds, usually called the theory-theory. In this view, children build something like an everyday scientific theory of the mind, with concepts such as desire, belief and knowledge, and they revise that theory as evidence accumulates, much as a scientist revises a theory when observations do not fit. Wellman et al. (2001) describe a central transition in this theory: young children at first understand people as acting on their desires and on how the world is, and later come to understand that people act on beliefs, including beliefs that are false. On this account, understanding false belief is a conceptual change, a new idea about what minds are, not merely a gain in memory or attention.

The Task That Made the Question Measurable

Wimmer and Perner (1983) devised the task that made this transition testable. Children watched a story in which a boy named Maxi puts chocolate in one cupboard and leaves. While he is gone, his mother moves the chocolate to a different cupboard. Children were asked where Maxi would look for the chocolate when he returned. To answer correctly, a child must set aside what she knows, where the chocolate is now, and reason from what Maxi believes. In their studies, most three- and four-year-olds said Maxi would look where the chocolate actually was, while most children aged six to nine answered correctly; the transition fell around the fourth to sixth year.

Applied to Four-Year-Olds

Four is the age the theory places at the center of the transition. Wellman et al. (2001) combined results from many false-belief studies and found that performance improved steadily between about three and five, with children crossing from mostly incorrect to mostly correct answers at around four. The improvement held across task versions and across countries, which the authors took as evidence of a genuine conceptual change rather than an artifact of one procedure.

In behavior, this shows in ways an observer could see. A typical four-year-old who has just learned that a box of crayons actually contains candles will, a few months later, often predict correctly that a friend who has not looked inside will think it holds crayons. The same child begins to keep secrets deliberately, plays hiding games in which she takes account of what the seeker can see, and in pretend play explains to a playmate what her character does not know. Each of these depends on representing a belief that differs from reality.

The theory also predicts that some factors should speed the transition, because they give children more evidence about minds. Wellman et al. (2001) found that certain task changes, such as making the deception explicit or having the child participate in moving the object, improved young children's performance, consistent with the idea that the concept was emerging and could be supported.

What the Framework Predicts About Differences Between Children

If understanding belief is a theory children build from evidence, then children who receive more evidence about minds should build it sooner. Perner et al. (1994) tested one version of that prediction by comparing three- and four-year-olds with and without siblings. Children with more siblings passed false-belief tasks more often, which the authors interpreted as the effect of daily experience with other people's differing knowledge, intentions and tricks. The finding fits the theory-theory well, since siblings supply a steady stream of situations in which someone else wants, knows or believes something different. It is correlational, however. Families with more children may differ in other ways, and the study cannot show that siblings caused the earlier understanding. The prediction itself is the useful part: the framework expects the age of the transition to vary with experience rather than being fixed by maturation, and that expectation can be tested in many ways, from family conversation to schooling.

Evidence That Has Qualified the Account

The strongest challenge came from studies of infants. Onishi and Baillargeon (2005) showed 15-month-olds a scene in which an actor watched a toy placed in one of two boxes, then, in some conditions, the toy moved while the actor could not see. Infants looked longer when the actor searched where the toy really was, rather than where she should have believed it was, as if surprised. Because infants look longer at events that violate their expectations, the authors argued that 15-month-olds already expect people to act on beliefs, including false ones.

If that interpretation is right, the theory-theory's account of a conceptual change at four needs revision. One response distinguishes an early, implicit sensitivity to others' beliefs, shown in looking behavior, from the explicit ability to answer questions about beliefs, which develops around four. On that reading, what changes at four is the ability to reason about beliefs in words and to use that reasoning deliberately, not the first appearance of any understanding of belief. Researchers continue to debate how robust the infant findings are and what they show, and later attempts to reproduce some of them have produced mixed results.

Assessment

The theory-theory describes the explicit transition at four well, and the meta-analytic evidence for that transition is strong. It struggles to explain why infants appear sensitive to false beliefs years earlier. The most defensible conclusion is that the framework accounts for how children come to reason explicitly about other minds, while the origins of that understanding may lie earlier and take a different form than the theory first proposed.

Limits

The studies discussed here mostly tested children in laboratory settings with standardized stories, and the infant studies relied on looking time, which can be interpreted in more than one way. The examples of four-year-old behavior in this paper are illustrative composites, not observations of a real child. Most samples came from Western, middle-class families, and the age of the transition may differ in communities where children spend more time with siblings or other children, as the sibling research would predict, or where talk about thoughts and feelings is less common in conversation with young children.

References

Onishi, K. H., & Baillargeon, R. (2005). Do 15-month-old infants understand false beliefs? Science, 308(5719), 255-258. https://doi.org/10.1126/science.1107621

Perner, J., Ruffman, T., & Leekam, S. R. (1994). Theory of mind is contagious: You catch it from your sibs. Child Development, 65(4), 1228-1238. https://doi.org/10.2307/1131316

Wellman, H. M., Cross, D., & Watson, J. (2001). Meta-analysis of theory-of-mind development: The truth about false belief. Child Development, 72(3), 655-684. https://doi.org/10.1111/1467-8624.00304

Wimmer, H., & Perner, J. (1983). Beliefs about beliefs: Representation and constraining function of wrong beliefs in young children's understanding of deception. Cognition, 13(1), 103-128. https://doi.org/10.1016/0010-0277(83)90004-5