Guided by a transactional model, we examined the predictors and effects of exposure to externalizing peers in a low-risk sample of preschoolers and kindergarteners. On the basis of daily observations of peer interactions, we calculated measures of total exposure to externalizing peers and measures of exposure to same-and other-sex externalizing peers. Analyses of predictors of externalizing peer exposure supported a homophily hypothesis for girls. Tests of peer contagion effects varied by sex, and exposure to externalizing peers predicted multiple problem behaviors for girls but not for boys. Sex differences were a function of children's own sex, but not of peers' sex. The study provides evidence of externalizing peer exposure effects in a low-risk sample of young children, notably for girls.Keywords peer exposure; externalizing behavior; sex differences; early childhoodThe title of our paper reflects the possibility that exposure to peers can affect who we are and what we become. Support for this idea has been generated by studies showing that peers have the potential to be powerful influences on the development of problem behaviors. For example, as aggressive adolescents interact with their peers, they reinforce deviant communication and interaction patterns, thereby encouraging each other to engage in more antisocial and delinquent behaviors (Dishion, Spracklen, Andrews, & Patterson, 1996). That this effect can be seen in naturally occurring peer groups (e.g., mutual friendships), as well as contrived ones (e.g., intervention groups), suggests that this is not simply a function of selection bias. Instead, this appears to be due to a more fundamental peer process in which exposure to aggressive peers socializes negative behaviors.In this study, we extended this line of research in several ways. The primary aim was to consider peer exposure processes in early childhood, focusing on the mechanisms that bring some young children into greater contact with relatively more externalizing peers and the consequences of such peer exposure for young children. To address these issues, we drew on a transactional model, and we considered the roles of children's own and peers' gender. Our secondary aims were methodological. We examined externalizing peer exposure processes in a sample of young children who were at low risk for the development of antisocial behavior. Doing so allowed us to consider the universality of peer exposure processes (Luthar & Becker, 2002;Sroufe, 1990). Additionally, we introduced a new strategy for studying peer exposure effects.3 Address all correspondence to Laura Hanish at Department of Family and Human Development, Arizona State University, Box 872502, Tempe, Arizona 85287-2502; e-mail: laura.hanish@asu.edu.. 2 Contributed equally to the conceptualization of this project.
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A Transactional Model of Externalizing Peer Exposure in Early ChildhoodA central question in this work is a developmental one;...