Examined sequential dependencies in solitary and interactive states of social organization as a function of age, sex, and type of toy in 12 triads of 3 1/2- and 5-year-old children. Each triad was observed during two 30-minute sessions, one in which objects with highly specific functions were available and one in which objects with relatively…

In a double-baseline design, children were observed first after being asked to take care of a baby then after watching a male or female adult demonstrate appropriate interactions with the baby. Younger and older day care children (between 30 and 63 months old) participated. (Author/RH)

The sex-typed and sex-neutral activities of 54 preschoolers and their peers' negative and positive responses were recorded during free-play periods in three mixed-age day care classrooms. Each child was observed for a total of 100 minutes of peer interaction. (Author/RH)

Reports an experiment in which 80 male and female six and eight year olds were presented with pictures consistent or inconsistent with sex stereotypes and pictures of neutral activities. Later, subjects performed a picture-recognition task. Among the variables investigated were subjects' labeling of pictures and sex-stereotype consistency. (CB)

Investigates the developmental sequence of learning to transform objects into agents and recipients of action in early symbolic play. Each of 48 children (from 14 to 25 months old) demonstrated initiative pretending after an adult modeled agent and recipient substitutions in pretending to talk on the telephone. (Author/CB)

A total of 20 five-year-old children were observed in two different preschools to examine conciliatory and subordinate behaviors following conflicts and to determine these behaviors' relationship to subsequent interaction (i.e., separation or peaceful association). Discusses the importance of conciliatory gestures in resolving social tension. (CB)

Examines the effect of an unfamiliar peer in a situation requiring a subject's separation from mother in order to play with attractive toys. Observation of 20 children 18 months old and 20 children 30 months old revealed that peer presence facilitated initial separation for both ages, but that age differences in subsequent behaviors existed. (CB)

Examines the findings of 53 studies of sex differences in propositional logic, combinatorial reasoning, and proportional reasoning tasks. Finds sex differences for the latter two tasks to be vulnerable to Rosenthal's "file drawer" problem and effect size to be small for all tasks. Discusses possible explanations for sex differences in terms of the…

Examines the tendency of observers to make less reliable recordings of behavorial events when a calibrating observer is absent. Using four different multicategory systems, 26 experienced observers coded 200 hours of videotaped family interactions. Concludes that observers lapse into a less attentive "set" prior to coding without a partner,…

Advances in the neurosciences have created exciting possibilities for interdisciplinary collaboration. The benefits of and barriers to collaboration with developmental psychology are discussed in this introduction to a special section of Child Development. (BN)

The role of experience in the developing brain is considered. A categorization scheme based upon the type of information stored and the brain mechanisms involved in storing the information is proposed. Experience-expectant and experience-dependent information storage are differentiated. (BN)

Reviews Greenough, Black, and Wallace's (1987) conceptual framework for understanding the effects of early experience and sensitive periods on development, and illustrates the applicability of their model with recent data on the consequences for animals and human infants of the acquistion of self-produced locomotion. (BN)

The goals of this review are to: (1) provide a set of concepts to aid in the understanding of complex processes which occur during central nervous system (CNS) development; (2) illustrate how they contribute to our knowlege of adult brain anatomy; and (3) delineate how modifications of normal developmental processes may affect the structure and…

The role played by neuroembryological forces in shaping brain development is well documented in Nowakowski's (1987) article. Additional mechanisms whereby experience may influence brain structure and function are outlined. Several routes exist by which postnatal experiential influences may produce long-term alterations in behavior and…

Recent studies on the biological development of the prefrontal cortex in rhesus monkeys are reviewed. These studies have elucidated the basic neural circuitry underlying the delayed-response function in adult nonhuman primates and suggest that a critical mass of cortical synapses is important for the emergence of this cognitive function. (BN)