Jigsaw puzzles are ubiquitous developmental toys in Western societies, used here to examine the development of metarepresentation. For jigsaw puzzles this entails understanding that individual pieces, when assembled, produce a picture. In Experiment 1, 3- to 5-year-olds (N = 117) completed jigsaw puzzles that were normal, had no picture, or…

Although some evidence indicates that even very young children engage in rudimentary forms of strategic behavior, the underlying mechanisms remain largely unknown. This study tested the hypothesis that uncertainty monitoring underlies such behaviors. Three-, four-, and five-year-old children ("N" = 88) completed a perceptual…

This longitudinal study combined, in a single study, different aspects of children's knowledge about mental phenomena and thus could investigate relations among the development of language, theory of mind, and later metamemory. In total, 183 German children were tested at ages 3, 4, and 5. Each time of testing included a set of theory-of-mind…

Used stories involving self-deception, lying, and misleading appearances to examine 4- to 9-year olds' understanding of the relations between false belief, evidence, and epistemic responsibility. Found that younger children who understood false belief understood simpler types of deception but that understanding self-deceivers' epistemic…

Four experiments studied 4- to 6-year-old children's understanding of inferential reasoning as a source of knowledge. To assess understanding that knowledge of relevant premises leads to knowledge of the conclusion, children had to judge the knowledge of another person, who was presented to the child as being aware of two premises. (Author/BN)

Compared performance of preschool children, chimpanzees, and orangutans on nonverbal task of false-belief understanding and tested children's performance on a verbal version of the same task. Found that children's performance on verbal and nonverbal tasks were highly correlated, and no chimp or orangutan succeeded in the nonverbal false-belief…

Two studies with 3-, 4-, and 5-year-olds examined whether young children can differentiate expertise in the minds of others. Findings indicated that all children could correctly attribute observable knowledge to familiar experts, such as a car mechanic. Preschoolers had difficulty making attribution of knowledge of scientific principles to…

Investigated the ability of 56 children of 2-4 years to deceptively lead others into false beliefs. Results show that 2 1/2-year-olds already practice a variety of deceptive strategies that presuppose an operative theory of mind. (RJC)

Four-year olds, 6-year olds, and adults were given a computer-game mental rotation task, but with no instructions on mental rotation or other mental activity. Reaction time patterns and verbal reports revealed that 6-year olds were comparable to adults in spontaneous use and subjective awareness of mental rotation. Four-year olds who referred to…

Cumulative experience with a variety of symbolic artifacts has been hypothesized as a source of young children's increasing sensitivity to new symbol-referent relations. Evidence for this hypothesis comes from transfer studies showing that experience with a relatively easy symbolic retrieval task improves performance on a more difficult task.…

The purpose of this research was to examine developmental changes in the knowledge about what variables affect performance on the incidental learning task. Kindergarteners, second graders, fifth graders, and college students indicated on a rating scale how many animals a hypothetical person would remember under easy and difficult levels of each…

Five experiments compared metamemory abilities in 6- to 9-year olds with autism, mentally retarded children, and normal controls. Found that children with autism were not impaired on any of the metamemory tasks, although they were less likely than controls to make spontaneous use of memory strategies involving other people. Unexpectedly few…

Interviewed 5-, 6-, 7-, 8-, and 10-year olds, and adults regarding their knowledge about primary-consciousness, reflective-consciousness, and control activities. Found that the recognition that people do not engage in conscious mental activities when unconscious is still developing during the late middle-childhood years. (Author/KB)

Three studies used illustrated stories to examine preschoolers' understanding of emotional changes when memories of past events were cued by objects in the current environment. Found substantial development between 4 and 6 years in understanding the influence of mental activity on emotions. The strength and consistency of this knowledge was…

Examines preschool children's ability for advance planning and mishap prevention or remediation related to familiar events. Indicates that children three to five years old appear to use general event knowledge in constructing verbal plans. However, developmental differences in the quality of plans suggests that the ability of using general…