main research findings are:
watching violence on screen is related to increased aggression, desensitisation to violence and increased fear of crime;
violence in the media may contribute to violent crime, but is not a single cause, because there are many other variables which contribute to violent behaviour;
some people may imitate what they see on television and video (and many do not);
violence on screen may reinforce the behaviour of already aggressive people;
the relationship between viewing violent screen images and exhibiting aggressive behaviour, appears to be bi-directional. That is, aggressive people are more likely to watch violence, and people who watch violence are more likely to be aggressive;
the context in which violence is portrayed plays a critically important role in relation to its effects;
the effects from on-screen violence can be short or long term;
children are most at risk from these effects, and young adults may also be at risk;
males appear to be slightly more at risk than females;
the general public is concerned about the effects of on-screen violence;
parents have an important role to play in supervising their children's viewing, teaching children about the differences between television or film violence and real-life situations, and encouraging critical evaluation of on-screen images;
despite the potential influence of violent entertainment on violence in society, it is not clear whether the impact is significant in comparison to the impact of other environmental variables such as family circumstances, violence or abuse in the home, parental influence, poverty, health, education, racism, cultural disintegration, and substance abuse.