Two experiments were conducted to study the development of mental rotation abilities in late childhood, adolescence, and adulthood. Subjects were third, fourth, and sixth graders, and college students. (MP)

Between 24 and 26 children in each of grades 3, 5, 7, 9, and 11 (with mean ages of 8.5, 10.2, 13.0, 15.0, and 16.6 years, respectively) were tested in their ability to solve linear syllogisms. (Author/MP)

Examined contributions of cognitive processing speed, short-term memory capacity, and attention to infant visual recognition memory. Found that infants who showed better attention and faster processing had better recognition memory. Contributions of attention and processing speed were independent of one another and similar at all ages studied--5,…

Two experiments investigated kindergarten through fourth-graders' and adults' ability to evaluate the certainty of deductive inferences, inductive inferences, and guesses, and explain the origins of inferential knowledge. Findings indicated that children rated their own deductions as more certain than guesses, but when judging another person's…

Examined developmental and individual differences in tendencies to favor analytic over heuristic responses in three tasks (inductive reasoning, deduction under belief bias conditions, probabilistic reasoning) in children varying in age and cognitive ability. Found significant increases in analytic responding with development on first two tasks.…

Examined effects of orthographic context on the letter recognition skills of dyslexic children, comparing their performance to that of adults and of chronological and reading age-matched groups. Results showed that the two matched groups showed strong word superiority effect (WSE) for words and pseudowords over nonwords. Dyslexic readers did not…

Examined the role of individual differences in working memory and lexical access in age- and reading skill-related differences in performance on phonological synthesis tasks. The performance of 28 kindergarten, first-, and second-grade students with normal reading skills, and that of 28 reading-disabled second graders, was compared under four…

Two experiments examined the development of children's memory for spatial location or color. Results refuted the proposal that in contrast to color, spatial location would not show developmental improvement because it is remembered automatically. Suggests that, for the age range studied, there was developmental change in the efficiency of…

Investigated development of working memory in the transitional period from infancy to preschool years. The age-related increase in scores on the Imitation Sorting Task (IST) appeared to be about one unit every six months. Results suggest that the IST has a good construct validity. (AA)

Videorecorded stimuli were used to assess social information processing patterns in 3 domains (peer group entry, response to provocation, and response to authority directive) in 259 first, second, and third graders. Teacher and peer ratings of behavior competence supported the hypothesis that children's behavioral competence is a function of…

A total of 87 children, 3- to 7-years old, were examined in a study of children's play and reasoning in games of mathematical logic and social logic. Children's sophistication in reasoning was positively related for two games, suggesting a common three-level progression from mastery of procedures to a competitive attitude to advanced strategy. (SH)

Four experiments examined the possibility that second and fourth graders and college students are sensitive to inference constraint when they make causal inferences and assess their understanding of a story. Inference likelihood and understanding ratings varied with constraint for all ages. Results suggest that comprehension monitoring and text…

Examines perceptions of adults compared with preschool children in assuming object permanence or discontinuity of existence when an object is removed from their immediate perceptual field. Results showed that a belief in the possibility of the discontinuity of material objects is not unique to the minds of preschool children but can also be…

Used stepwise discriminant analysis on calibration sample (n=135) of juvenile inpatients to determine which variables best distinguished violent inpatients. Cross-validated model on 123 subjects. Violent subjects were more likely to be younger males with family history of criminal behavior and extensive discord. Violent subjects showed differences…

Reviews developmental literature on cognitive gender differences; and compares past and present trends in gender differences, by age, from standardizations of the Wechsler Intelligence Scales and the California Achievement Tests. Decreases are found in gender differences for adolescents but not for adults. Implications are discussed. (SLD)