Most studies done on violence and video games support the conclusion that violent video games can increase aggressive behaviour in children and adolescents, especially boys, researchers said on Friday.
An analysis of 20 years of research shows the effects can be both immediate and long-lasting.
"The majority of the studies would suggest there are effects," said Jessica Nicoll of Saint Leo University in Saint Leo, Florida, who worked on the study.
One study showed that children who played a violent game for less than 10 minutes and then took a mood assessment test rated themselves with aggressive traits and aggressive actions shortly after playing.
Teachers of 600 8th and 9th graders, aged 13 to 15, said children who spent more time playing violent video games were more hostile than other children and more likely to argue with authority figures and other students.
The findings, presented at an annual meeting of American Psychological Association, prompted the group to adopt a resolution recommending that all violence be reduced in video games and interactive media marketed to children and youth.
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