Experimental evidence by psychologists concludes that the negative effects of playing violent video games can accumulate over time.

The psychologists found that people who played a violent video game for three consecutive days showed increases in aggressive behavior and hostile expectations each day they played. Those who played nonviolent games showed no meaningful changes in aggression or hostile expectations over that period.

Other experimental efforts have shown that a single session of playing a violent video game increased short-term aggression but this is the first to show longer-term effects, according to Brad Bushman, co-author of the study and professor of communication and psychology at Ohio State University.

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