Tested hypothesized relationship between development of a theory of mind and increasing computational resources in 3- to 5-year olds. Found that the correlations between performance on theory of mind tasks and dual processing tasks were as high as r=.64, suggesting that changes in working memory capacity allow the expression of, and arguably the…

Examined role of accuracy motivation in event recall among 6-, 7-, and 8-year-olds, and adults. In high accuracy motivation condition, children as young as 6 were to withhold uncertain answers for benefit of accuracy. Expected quality-quantity tradeoff emerged only for peripheral items. The "I don't know" option condition decreased the…

Examined relationships among theory of mind construct of intention and false belief, problem-solving ability, metacognitive regulation, and strategy use in 39 preschoolers. Found significant correlations between strategy use and theory of mind, and metacognitive regulation and theory of mind. A moderate, but nonsignificant, correlation was found…

Studied a new approach, based on Rasch model item response theory, to age equivalence scores as a basis for mental age and the calculation of ratio IQ. Results for 1,719 children and adolescents suggest that the new ratio IQ had consistent criterion and construct-related validity at the same level as standard-score IQ. (SLD)

Examined age and gender differences regarding the nature, meaning, and function of cherished possessions. Among the significant differences found were that younger children were egocentric in meanings assigned to cherished possessions, whereas older children held social relationships meaningful; females favored items to be contemplated, while…

Three experiments examined the relative importance of original function and current function in artifact categorization for young children and adults. It was concluded that 6-year-olds have begun to organize their understanding of artifacts around the notion of original function, whereas 4-year-olds have not. Data were examined in terms of how…

Six match-to-sample picture/object selection experiments explored 3- to 5-year-olds' knowledge about superordinate words and acquisition of this knowledge. Findings indicated that number of standards (one versus two), types of standards (different versus same basic-level categories), and nature of representation (pictures versus objects)…

Three habituation experiments examined the necessary conditions under which infants invoked the principle of rational action, interpreting behavior as goal-directed action. Found that the rational action principle operated at 9 months but not at 6 months. Perceptual cues indicating agency were not necessary prerequisites for a goal-directed…

Examined whether preschoolers could recognize numerical equivalence for comparisons involving sequentially presented sets. Found that children recognized numerical equivalence for static sets earlier than for sequential sets. Memory of the number of sequentially presented objects emerged earlier than memory for the number of sequential events.…

Explored in 2 studies 3- and 4-year-olds' understanding that the 5 senses can each lead to different types of knowledge. Found that 3-year-olds performed significantly poorer than 4-year-olds on all tasks, suggesting a marked transition in children's ability to recognize the origin of their modality-specific knowledge between 3 and 4 years.…

Presents emergentist coalition theory of language development characterizing lexical acquisition as the emergent product of cognitive constraints, social-pragmatic factors, and global attentional mechanisms. Details 12 experiments with 12- to 25-month-olds using the development of reference as test case of the theory. Presents evidence that…

Investigated in 3 studies whether 2- to 4-year-olds make accurate causal inferences on the basis of patterns of variation and covariation. Found that all three age groups considered information from various patterns of variation and covariation in judgments regarding two objects and activation of a machine. Three- and 4-year-olds used the…

Examined in 2 studies the ability of 2- and 3-year-olds to learn to use tools via imitation. Found that when shown a correct solution to a tool-using task, all children managed at least a partial solution. When shown an incorrect followed by a correct solution, 2-year-olds produced a partial solution and most 3-year-olds produced a full solution.…

The counterintuitive developmental trend in the Deese-Roediger-McDermott (DRM) illusion (that false-memory responses increase with age) was investigated in learning-disabled and nondisabled children from the 6- to 14-year-old age range. Fuzzy-trace theory predicts that because there are qualitative differences in how younger versus older children…

Participants were interviewed about the biological and psychological functioning of a dead agent. In Experiment 1, even 4- to 6-year-olds stated that biological processes ceased at death, although this trend was more apparent among 6- to 8-year-olds. In Experiment 2, 4- to 12-year-olds were asked about psychological functioning. The youngest…