Beginning in sixth grade at an average age of 11.9 years, 416 adolescents and their parents participated in 4 waves of data collection involving family observations and multiple-reporter assessments. Ecological theory and the process-person-context-time (PPCT) model guided the hypotheses and analyses. Lagged, growth curve models revealed that…

This study examined parenting variables as protective factors to reduce the influence of school and peer risk factors on adolescents' aggression. Five waves of data spanning 3 years were collected from 5,581 students at 37 schools who began the 6th grade in 2001 or 2002. Class-level and perceived school norms supporting aggression, delinquent peer…

Based on a sample of 406 seven-year-old twins, this study examined whether exposure to friends' social or physical aggression, respectively, moderates the effect of heritability on children's own social and physical aggression. Univariate analyses showed that children's own social and physical aggression were significantly explained by genetic…

Over five days, videotaped and analyzed contrived play sessions of African-American male first and third graders to examine behavioral patterns leading to chronic victimization by peers. Victims demonstrated lower rates of assertive behaviors and higher rates of nonassertive behaviors than nonvictims. Children who eventually emerged as chronic…

Group status was examined as a moderator of peer group socialization of deviant, aggressive, and prosocial behavior. In the fall and 3 months later, preadolescents and early adolescents provided self-reported scores for deviant behavior and group membership, and peer nominations for overt and relational aggression, prosocial behavior, and social…

Developmental changes were examined in the associations among physical and relational aggression, and sociometric and perceived popularity based on peer nominations. Participating in the longitudinal study were 905 children (440 girls, 465 boys) from ages 10 to 14. Associations between the forms of status and between the forms of aggression…

Tested the individual characteristics and deviant peer association theoretical models of friends' influence on the development of delinquency in disruptive boys. Found that moderately disruptive boys with aggressive-disturbing friends were more delinquent at age 13 than other subgroups of moderately disruptive boys. Highly disruptive and…

Peer contagion of adolescent males' aggressive/health risk behaviors was examined using a computerized "chat room" experimental paradigm. Forty-three 11th-grade White adolescents (16-17 years old) were led to believe that they were interacting with other students (i.e., "e-confederates"), who endorsed aggressive/health risk behaviors and whose…