An overt rehearsal procedure was used to investigate the relationship between children's rehearsal strategies and free recall performance. Subjects were 72 third- and 72 sixth-grade children. Investigated were the effects of increased processing time and rehearsal training upon recall. (MS)

Examined whether prudence and altruism, in situations involving future desires, follow similar developmental courses between ages 3 and 5. Tested children on ability to forego current opportunity in order to gratify their own future desires or those of research assistant. Found that between ages 3 and 4, children develop some common mechanism…

Three experiments examined preschoolers' and adults' understanding of distinctive semantic functions of adjectives and count nouns. Found that 4-year olds and adults, but not 3-year olds, who heard the adjective version (e.g., "a blue bird") were more likely than those who heard the count noun version ("a bluebird") to choose…

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…

Examined bias in reasoning in adults and in children, ages five through nine years, by presenting story or videotape true/false messages. Found that adults made judgments contaminated by their own background knowledge abut the believability of the message more frequently than did children. (ET)

Two marble-and-ramp experiments investigated whether a simple-to-embedded-rules account can explain changes in children's causal reasoning. Results indicated that the same difference between three- and four-year olds in the prediction experiment appeared in the action experiment, suggesting that the same rules may underlie causal action as well as…

Measured cognitive processing time, imagery skill, and spatial memory span of 128 children and adults, ages 8 to 20 years. Found that performance on spatial memory span tasks was largely predicted by imagery skill, which in turn was strongly linked to processing time; age was much less of a predictor in both cases. (EAJ)

Two experiments yield data suggesting that the structure of children's concept of artifact function changes profoundly between age 5 and 7, with striking effects on problem-solving performance. This effect is not caused by differences in children's knowledge about the typical use of particular tools, but rather, is mediated by the structure of the…

Investigates whether the critical period for cognitive transition from concrete operations to formal operations at 12-14 years of age actually exists. Uses the Cognitive Acceleration through Science Education (CASE) intervention program in Malawi. Discusses the existence of the critical period, academic achievement, and explanations for age and…

Developed the Gender Stereotyping Test, a sorting task that identifies the type of information used by young children to assign objects or qualities to each sex. Found that 4-year olds with knowledge of gender identity were more likely to gender type metaphorical, but not conventional, items than children without stable, constant gender identity.…

Two experiments investigated short-term visual person recognition in 8- and 10-year-olds and adults within Tanaka and Farah's part-whole paradigm. Results revealed that person recognition became more accurate between 8 years and adulthood but there was no developmental shift in visual information processes with face and whole person recognition.…

Considers how students' mathematical thinking evolves as a result of their actions and everyday experiences and from increasing reliance on introduced mathematical principles and representations. Exemplifies how 8- to 10-year-olds' personal representations come to face with representations involving algebraic concepts. Explores implications for…

Three experiments examined development of perceptual causality in 3- to 9-year-olds. Findings indicated that participants of all ages assigned contact events (A moves toward B, which moves upon contact) to the physical domain and non-contact events (B moves before contact) to the psychological domain. Participants chose causality more often for…

This study investigated whether kindergartners would advocate sharing toys equally across situations or on the basis of recipients' characteristics, and whether each group member would be counted as one unit for allocation across situations. Findings indicated that kindergartners tended to allocate more blocks to a younger child than to a same-age…

Examined preschoolers' suggestibility when initial beliefs about an object's identity were contradicted by experimenter's suggestion. Found that subjects were good at accepting the suggestion only when the experimenter was better informed than they. Children were least accurate at reporting whether their final belief was based on what they were…