There are some studies which show a link: By Joe Tidy, Sky News Reporter
A comprehensive study of studies claims to have found definitive evidence that playing violent video games leads to aggression.
The report from the American Psychological Association (APA) reviewed more than 300 violent video game papers published between 2005 and 2013.
Players were tested in a variety of ways over a variety of time periods from the short term to the longer term - and researchers concluded that violent video game use has an effect on aggression.
"The research demonstrates a consistent relation between violent video game use and increases in aggressive behaviour, aggressive cognitions and aggressive affect, and decreases in pro-social behaviour, empathy and sensitivity to aggression," the report concludes."
His take on it is... subjective. There is a link, but the paper's take is that it's likely the players who are naturally more aggressive choose the more violent games, not that the games cause the aggression.
The exception to that was particularly young children, which is part of the justification for age categories on games (which are typically ignored, unfortunately), though even there the data weren't conclusive.
That reported aggression was almost entirely short-term - minutes, not even hours - and the two papers that reported longer-term effects were both on extremely small cohorts where statistical deviations are quite likely.
The conclusion from the authors of the paper is significantly more neutral than Tidy's reporting: they acknowledge a degree of correlation, but not causation, between violent video game use and aggression in the short term, no reliable evidence of long term links and - most importantly - no evidence of sufficient effect to imply it's a significant factor in actual violent events.
This is entirely in keeping with the findings of the effects of violent films and the much less studied effects of depictions of violence in books and comics - that it has a short term effect of viewers/players, but should be kept away from impressionable children.
O.