Playing violent video games for just 20 minutes a day can encourage aggressive behaviour

Playing violent video games for just 20 minutes a day can encourage aggressive behaviour University students were asked to play a violent video game or a driving game over three daysThey were then set a couple of tests to see how they reacted to the outside worldThose who played shoot-em-ups like Call of Duty were more likely to assume the world was hostile and react aggressively | UPDATED: 16:57 GMT, 11 December 2012 Playing a violent video game for just an hour over a three-day period is enough to increase aggressive behaviour, according to a new study.