In this article, research on nonhuman animals is reviewed to show that there is no discontinuity between humans and other animals. For both, high density is not necessarily harmful. Rather, the effect of high density depends on other factors in the situation. (Author)

Research strategies used to study human aggression include laboratory study, experimental simulation, field experiment, field study, judgment task, sample survey, and less empirical strategies such as computer simulations and formal theory. The context of these strategies can be classified as either contrived, natural, or irrelevant. Major issues…

Argues that field research can provide evidence about the long-term socialization and developmental effects of media violence on viewer's behavior. Summarizes findings from a number of quasi-experimental studies about the effects of naturally occurring media violence. Concludes that these findings are often consistent with the hypothesis that…

Reports video game playing demographics. Reviews the literature on video game health hazards and positive health applications; cutting-edge applications in education and controversies about learning; and effects on personality. Discusses laboratory and survey research on the effects of video games violence. Considers whether some children may be…