Evidence supports the hypothesis that adolescent peer groups play a significant role in the genesis of youth antisocial behavior. A longstanding interest in research focused on individual differences in teen exposure to deviant peer groups is the notion that high-risk youth aggregate because of their common rejection within social contexts, such…

This volume is an eclectic group of chapters that use vastly different methodologies, focus on distinct content areas, and examine diverse conceptual issues. Yet, the five studies on social network presented in this article share a common center as each is aimed at elucidating its structural features and their contributions to development. In this…

Social developmentalists typically distinguish three levels of analysis in the study of peer relations in childhood and adolescence: individual, dyadic, and group. At the individual level of analysis, sociometric status and individual social behavior are studied. At the dyadic level, researchers traditionally study friendships but increasingly…

Puberty alters the interplay of attachment, sexual, and affiliative systems; initiates the search for a peer attachment; and begins the reorganization of adolescents' attachment hierarchies.

The focus of this chapter is continuity and change in attachment representations in a sample at risk because of early poverty. Its particular emphasis is adolescence and reasons that adolescence may be a period of attachment security change in the at-risk population. The authors begin with an overview of key issues in adolescent attachment,…

A key proposition of attachment theory is that experience-based cognitive representations of attachment, often referred to as internal working models of attachment, influence the manner in which individuals process attachment-relevant social information (Bowlby, 1969/1982, 1973, 1980; Bretherton & Munholland, 1999; Main, Kaplan, & Cassidy, 1985).…

The vast majority of adolescents have at least one sibling, and most are raised by the same parent or parents. What then might researchers expect two adolescent siblings' representations of attachment to parents to be like? Are both siblings likely to exhibit similarly secure or insecure representations, or is it just as likely that one sibling…

Examined relations between social behavior and daily patterns of a stress-sensitive hormone production in preschool children attending center-based child care. For boys, externalizing behavior was positively associated with cortisol reactivity, while internalizing behavior was negatively associated with median (typical) cortisol. Median cortisol…

Investigated 4- and 7-month olds' matching of unfamiliar, dynamic faces and voices on basis of age or maturity. Found significant matching at both ages; infant's prior experience with children appeared to facilitate matching at 7 months. Also found visual preference for children's faces. Another experiment assessed matching by 7-month olds, only…

Examined performance on neuropsychological tests (tapping the medial temporal lobe and related limbic structures, and the dorsolateral prefrontal cortex, respectively) in relation to performance on tasks assessing autistic symptoms in young children with autism, and developmentally matched children with Down syndrome or typical development.…

Used behavioral genetic methods and environmental assessment techniques to assess maladaptive behavior in 6- to 11-year-old twin pairs. Found that genetic variation accounts for majority of variance in parent-reported child maladaptive behavior; in contrast, observational coding and global impressions of parent-twin interactive behavior suggest…

Examined longitudinally the effects of infants' age, body dimensions, and experience on the development of crawling. Although most infants displayed multiple crawling postures en route to walking, development did not adhere to a strict progression of obligatory, discrete stages. Duration of experience with earlier forms of crawling predicted the…

Examined whether infants succeed in mapping novel adjectives applied ostensively to individual objects and to other objects with the same property. Found that infants hearing a target labeled with novel adjectives were more likely than those hearing no novel words to choose a matching test object when all objects were drawn from same basic level…

Assessed 2-year olds' ability to use semantic context to infer meanings of novel nouns and to retain those meanings. Found that children learned majority of novel words; however, they occasionally failed to choose the correct corresponding picture for a novel noun even when they understood the verb; also found a significant retention of newly…

Four-year olds, 6-year olds, and adults were given a computer-game mental rotation task, but with no instructions on mental rotation or other mental activity. Reaction time patterns and verbal reports revealed that 6-year olds were comparable to adults in spontaneous use and subjective awareness of mental rotation. Four-year olds who referred to…