Well this is more or less in my general field, and I have done research into the literature (published research) on this specific topic.
So far this is what we have. Research indicates that children are more likely to behave more violently after playing a violent video game (GTA or Doom or similar), which can be explained as modeled behavior. They also show fairly clear signs of desensitization towards violence (not surprising, strong exposure to anything always causes desensitization). Furthermore research shows that there is generally no catharsis or cathartic release (lowering of stress, or release of negative emotion) when playing these sorts of games, actually just the opposite as they tend to increase stress and arousal levels.
Now this applies to specific types of games, like FPS and similar, that feature high amounts of action and involvement, and high levels of graphical violence. Also the point is that this stuff increases violent behavior, not causes it. Many of these studies are correlational studies which cannot show causation or directionality. This means for example that we don't know if playing violent video games makes kids more violent, or if violent kids prefer to play violent video games, or if there is a third factor influencing them both.
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