General behavior patterns are one thing, but the dynamics of a specific category can be quite another.

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"We look at behavior and what's going on in the person's life, the social dynamics and what are the personality issues that make that person think acting out dangerously is a way to handle their problems, " said Mary Ellen O'Toole, a former FBI special agent and criminal profiler.

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The findings are "pretty good evidence" that violent video games do indeed cause aggressive behavior, says Dr. L. Rowell Huesmann, director of the Research Center for Group Dynamics at the University of Michigan's Institute for Social Research in Ann Arbor.

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