Preschool children were given a memory task that required repeating a list of animal names and a sentence imitation task. Results confirmed a relationship between word span and language imitation in younger preschool children and the notion of a memory constraint on early spontaneous language. Increasing mastery of linguistic rules appeared to…

Examined relationships among working memory, memory span, and reading skills in children and adults. Found that working memory and short-term memory skills develop through adolescence, but working memory skills show declines in adulthood. Age-related declines in memory appear to be related to the task's processing demands, which may affect the…

Two experiments examined developmental changes in accuracy of judgments about physical abilities in primary school children and college students. Subjects were asked to complete four physical tasks with and without benefit of practice. Found that children overestimated their physical abilities, individual differences in overestimation related to…

Examined children's ability to accurately monitor sources of suggested information. Age differences were found in the degree to which a misleading suggestion led subjects to believe they actually remembered seeing events that had in fact only been suggested to them. Proposes that these age differences reflect developmental differences in the…

Younger preschoolers had significantly more difficulty than older ones in making an appearance-reality distinction between a person's apparent character, as indicated by his or her facial expression, and the person's real character, as evidenced by his or her behavior. (BB)

Examined age differences in self-ratings of present and projected past and future cognitive performance across cognitive domains. Findings from 151 adults in their 20s, 40s, 60s, and 80s revealed that performance on fluid/speeded intelligence, memory, and reasoning tasks followed progression of poorer performance with age. Found age differences in…

Compared the collaborative patterns of seven- and five-year-old expert planners working with five-year-old novice planners on tasks requiring reverse sequencing strategies. Results suggest that cognitive gains are achieved when children collaborate with peers more expert than themselves in problem-solving activities. (MM)

Three samples of 8- to 16-year olds were assessed three times at yearly intervals on eight water-level items. Within-child change over age was viewed as stochastic process of the child changing or remaining in one of three latent strategy states. Although there was improvement in task performance over age, the general finding was that strategy…

Examined whether toddlers would use information presented through video to solve a retrieval problem. Found that 2.5-year-olds were very successful at finding a hidden toy based on viewing a televised hiding event, but 2-year-olds were not. Substantially better performance was achieved by other 2-year-olds who either watched or believed they were…

Three experiments with preschoolers tested the independence of the current state buffer from working memory. Findings indicated that when a teddy bear was an object put away with other toys, only half the preschoolers remembered its location despite explicit instructions. When the teddy was a character interacting with children, all remembered its…

Examined whether and when children use information about others' mental states to invent or select persuasive strategies in three studies. Found older children, but not preschoolers, used belief information in stories to select arguments; and kindergartners' and first-graders' reasoning on false belief tasks suggested the failure to consider…

Examined the moral and ecological reasoning of second, fifth, and eighth graders regarding the Exxon Valdez oil spill. Found that children understood negative effects of the spill, cared that harm occurred to shoreline and marine life, and thought it violated a moral obligation. Fifth and eighth graders used a greater proportion of anthropocentric…

A study involving 18 individuals with pervasive developmental disorders (PDD) (ages 9-21) and 67 controls found total score on the Biber Cognitive Estimation Test for both individuals with PDD and controls progressed consistently with mental age, development being the most dramatic around the mental age of 8 years. (Contains references.)…

Four studies examined the claim that preschoolers understood biological inheritance. Found that it was not until age seven that children demonstrated that they understood birth as part of a process selectively mediating the acquisition of physical traits and learning or nurturance as mediating the acquisition of beliefs. (MDM)

A total of 270 children from 3 ethnic groups were tested for understanding of concepts of heating and cooling. A strong horizontal decalage effect was seen, with children of all ethnic groups using more sophisticated explanations at earlier ages for heating than cooling. Implications for developmental theory are discussed. (SLD)