Not 100% on the subject, but something that can provide a sound psychological under-pinning.
http://en.wikipedia.org/wiki/Correlation_does_not_imply_causation
I figure the Wiki article will explain the premise well enough that you can research it properly, but the gist of it would be that violent kids are attracted to violent games, which is not the same as saying violent games cause kids to be violent.
On the flip side of that, video games are very likely having a psychological effect on us. Playing a racing game directly before driving will often lead to more reckless driving. And (not video game related), the Army increased the percentage of soldiers willing to fire on the enemy in combat simply by replacing the circular targets on the firing range with human-shaped targets. I serious wonder if said percentage has gone significantly up since the rise of realistic shooters.
http://en.wikipedia.org/wiki/Correlation_does_not_imply_causation
I figure the Wiki article will explain the premise well enough that you can research it properly, but the gist of it would be that violent kids are attracted to violent games, which is not the same as saying violent games cause kids to be violent.
On the flip side of that, video games are very likely having a psychological effect on us. Playing a racing game directly before driving will often lead to more reckless driving. And (not video game related), the Army increased the percentage of soldiers willing to fire on the enemy in combat simply by replacing the circular targets on the firing range with human-shaped targets. I serious wonder if said percentage has gone significantly up since the rise of realistic shooters.