The long-term import of a fundamental challenge of adolescent social development--establishing oneself as a desirable peer companion while avoiding problematic behaviors often supported within peer groups--was examined in a community sample of 184 adolescents, followed from ages 13 to 23, along with parents, peers, and romantic partners. The…

The extent to which peer influences on substance use in adolescence systematically vary in strength based on qualities of the adolescent and his or her close friend was assessed in a study of 157 adolescents (age: M = 13.35, SD = 0.64), their close friends, and their parents assessed longitudinally with a combination of observational, analogue,…

This study examined the effects of peer groups on changes in academic engagement in 11- to 13-year-old children. From the entire cohort of 366 sixth graders in a town, 87% participated at the beginning and end of the school year. Peer groups were assessed using socio-cognitive mapping; as an indicator of motivation, teachers reported on students'…

Investigates whether disputes arising between 21-month-old children, meeting for the first time in a laboratory playroom, showed one or more of the following social hallmarks: (1) a patterned interactive structure, (2) explicitly communicative content, including conventional gestures and intelligible speech, and (3) antecedent and consequent…

This study investigated peer selection and socialization effects on sexual behavior and attitudes using 1,350 15- to 18-year-old students participating in two waves of the National Longitudinal Study of Adolescent Health. Regarding socialization effects, friends' intercourse without condoms predicted later individual intercourse without condoms…

Examined relative influence of parenting behaviors (support, behavioral control, and psychological control) and deviant peers on trajectories of externalizing and internalizing problems in early adolescence. Found that parents' firm behavioral control seemed to halt the upward trajectory in externalizing problems among adolescents with deviant…

Examined adolescents' peer structures and the quality of their friendships as antecedents of romantic relationships among 180 high schoolers followed from grade 9 through 11. Found that small groups of close friends predicted other-sex peer networks that, in turn, predicted the emergence of future romantic relationships. Found indirect effects for…

Examined predictors of children's moral reasoning development over 4-year period. Found that parental and friend interaction during moral conflict discussions influenced development differently. Minimal moral development was predicted by friends' cognitive challenges to the target child's moral reasoning and by parents' interfering interactions.…

Examined the role of individual characteristics and peer influences in evoking early substance abuse in young boys. Individual characteristics, such as fighting, hyperactivity, oppositional behaviors, and likability, were found to be pivotal in the development of substance abuse--more than friends' deviance. Results suggest that prevention…