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Despite recent growth of research on prosocial media effects (e.g., Greitemeyer, 2011a & b), processes underlying these effects are not well understood. Two studies explored theoretically relevant mediators and moderators of prosocial media effects on helping. Study 1 examined associations among prosocial and violent media use, empathy, and helping with participants from 7 countries. Prosocial media use was positively associated with helping. This effect was mediated by empathy and was similar across cultures. Study 2 explored longitudinal relations among prosocial video game use, violent video game use, empathy, and helping in a large sample of Singaporean children and adolescents measured three times across two years. Path analyses yielded significant longitudinal effects of prosocial and violent video game use on prosocial behavior through empathy. Latent growth curve modeling revealed significant mediated effects of change in video game use on change in helping through change in empathy over the two-year period.

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Cultural generality versus specificity of media violence effects on aggression was examined in seven countries (Australia, China, Croatia, Germany, Japan, Romania, the United States). Participants reported aggressive behaviors, media use habits, and several other known risk and protective factors for aggression. Across nations, exposure to violent screen media was positively associated with aggression. This effect was partially mediated by aggressive cognitions and empathy. The media violence effect on aggression remained significant even after statistically controlling a number of relevant risk and protective factors (e.g., abusive parenting, peer delinquency), and was similar in magnitude to effects of other risk factors. In support of the cumulative risk model, joint effects of different risk factors on aggressive behavior in each culture were larger than effects of any individual risk factor.

Decades of research on the effects of media violence have examined associations between viewing aggressive material in the media and aggression and prosocial behavior. However, the existing longitudinal studies have tended to exclusively examine aggression and prosocial behavior as outcomes, with a limited range of potential mediators. The current study examines associations between playing violent video games and externalizing and prosocial behavior over a 5-year period across adolescence. Additionally, the study examines potential mediators of these associations, including empathic concern, benevolence, and self-regulation. Participants included 488 adolescents (M age of child at Wave 1 ϭ 13.83, SD ϭ 0.98) and their parents, who completed self-and parental measures at three different time points, each 2 years apart. Results revealed that early exposure to video game violence was indirectly associated with lower levels of prosocial behavior as mediated by lower levels of benevolence. Additionally, early video game violence play was associated with higher levels of externalizing behavior at the cross-sectional level, but not 5 years later. Implications of results for adolescents and parents are discussed.