It must be Halloween. With the season comes a new crop of violent and scary horror flicks. In lockstep with that comes a new study reportedly showing a connection between violent movies/games and consequences in teenagers, with the understood conclusion that such games and movies are detrimental to general behaviour.
When I leave an action movie, especially one that has car chase scenes, I feel an exhileration when I get into the car to drive home. I feel like I should be speeding through the streets and driving aggressively. Do I do it? No, not usually. Do I feel the same a half an hour later? No, not at all. The "rush" which may have been excitement, or adrenaline or may have been some kind of cognitive push, or (as this study suggests) an overstimulation of a specific part of my brain, Has faded away with no evidence at all that there is permanent or long term behavioural change.
If you look carefully at this and other similar studies, -and, as you know, I always encourage that any studies and statistics be carefully examined-, you see that there is no mention of long term behavioural change in the subjects. The study points to brain activity and hormonal changes during and immediately after engaging in violent media. There is, in fact, no measurement at all of behaviour. Therefore, there should be no conclusions about behaviour, other than what the teenage boy may do during the participation in these media. Also, I would suspect that you would find similar physical reactions to similar aggressive sports, such as hockey, where on ice fights are not uncommon. (In fact, the physical and probable long term effects are likely to be even stronger in sports because it is direct physical engagement wrapped in a way of life that extends beyond the ice rink.)
It is possible and likely that the violent movie or game has stimulated a measure of excitement and engagement, which is definitely going to produce heightened biochemical and neurological activity. I used the word "rush" above, and that is at least a major part of what is happening here. To infer more, is just that, -an inference.
In order to conclude anything about long term behaviour, you have to measure long term behaviour. That's not likely to happen, because psychology ethics is not going to allow you to randomly divide a group of teenage boys into two groups, then routinely expose half of them to violent media in order to measure long term behaviour, like whether they get into more fights or engage in criminal activity. But any other kind of study has got to admit that their conclusions are highly suspect. Studies that correlate hours of violent gaming to aggressive behaviour cannot prove causality. They have no way of proving whether the behaviour is the result of the gaming or the gaming is a result of the behaviour.
I think most teenagers have the ability to distinguish between fantasy and reality. It's called, achieving the "age of reason". Those teenagers who become over stimulated by violent media, are violent in their predisposition already and are going to find an outlet for that urge one way or another. It is in the area where the distinctions between fantasy and reality are blurred where we have to be really careful (like aggressive sports or media that masquerade as real life). Desensitization from watching the news and seeing the parade of corrupt politicians, religious leaders, military officers, etc, does more to desensitize morality in a teenager than playing any video game.