Adults attach special value to objects that link to notable people or events--authentic objects. We examined children's monetary evaluation of authentic objects, focusing on four kinds: celebrity possessions (e.g., Harry Potter's glasses), original creations (e.g., the very first teddy bear), personal possessions (e.g., your…

We examined young adults' essentialist reasoning about gender categories. Previous developmental results suggest that until age 9 or 10, children show marked essentialist reasoning about gender, but this disappears by early adulthood. In contrast, results from social cognition suggest that essentialist thinking about social categories…

Increasingly, cognitive developmental researchers are forming partnerships with museums as a way to achieve both overlapping and distinctive goals. Such partnerships can further our understanding of cognitive development by providing opportunities to study children's learning within social contexts. At the same time, these collaborations can…

Two experiments examined processes underlying cognitive inflexibility in set-shifting tasks typically used to assess the development of executive function in children. Adult participants performed a Flexible Item Selection Task (FIST) that requires shifting from categorizing by one dimension (e.g., color) to categorizing by a second orthogonal…

Piaget (1962) asserted that children stop engaging in pretend play when they enter the concrete operational stage because they become able to accommodate reality and no longer need to assimilate it to their wishes. Consistent also with the views of Vygotsky, discussion of pretend play in developmental psychology is typically confined to early…

This study examined the development of the episodic and semantic memory systems, with an emphasis on the emergence of the two aspects of the former: episodic memory (the ability to re-experience a past event) and episodic future thinking (the ability to pre-experience a future event). Three-, 4-, and 5-year olds were randomly assigned to one of…

This study examined if solving arithmetic problems hinders undergraduates' accuracy on algebra problems. The hypothesis was that solving arithmetic problems would hinder accuracy because it activates an operational view of equations, even in educated adults who have years of experience with algebra. In three experiments, undergraduates (N = 184)…

Extending research on age norms in adults, the development of the knowledge of two components of the cultural concept of biography, biographical salience of and age norms for life events was studied from late childhood to early adulthood in Study 1 and across adulthood in Study 2. The largest increase in knowledge was found between ages 8 and 12,…

As children develop, they process information more rapidly. The primary aim of this study was to determine whether processing speed in the language domain develops at the same rate as global processing speed. A second aim was to determine the stability of processing speed throughout childhood and adolescence. Children (N = 116) were tested on 10…

This study investigated how understanding of the equal sign changes as a function of experience in mathematics and variations in context. Students with different levels of mathematics experience (elementary school, seventh grade, undergraduate, and graduate) were randomly assigned to view the equal sign in one of three contexts: (a) equal sign…

Five-year-olds, 5 1/2-year-olds, 6-year-olds, and adults were tested for the presence of two intuitions about thinking hypothesized to be part of the adult theory of mind (a) when engaged in a mentally demanding activity, a person's thinking will be directed toward that activity, and (b) when the activity is not mentally demanding, the person's…

Literature on multivariable causal inference (MCI) and literature on scientific reasoning (SR) have proceeded almost entirely independently, although they in large part address the same phenomena. An effort is made to bring these paradigms into close enough alignment with one another to compare implications of the two lines of work and examine how…