Does game violence make teens aggressive?

I just wanted to talk about the article from my previous post a little.  This article supports my statement that parents should be watching what their children are playing.  "Researchers at the Indiana University School of Medicine say that brain scans of kids who played a violent video game showed an increase in emotional arousal – and a corresponding decrease of activity in brain areas involved in self-control, inhibition and attention."  The study was inconclusive if the effects are lasting or worse permanent.  However, one of my science teachers once told us that some scientists believe that the human brain does not forget anything we see or study but that we just lack the proper way to recall what we have learned.  If this is true then all that violence is just floating around in our sub-conscience waiting to get out.