There's another, bigger question to consider: if video games affect your mind so profoundly, it's probably a good idea to think a little before playing. I don't want to rephrase the article to say "think before buying," because that's an obvious part of anything we do--but if your pre-motor cortex actually replicates and primes your motor cortex to perform the Scout's baseball-bashing of Team Fortress 2, don't you at least want to consciously decide on what level it affects you? If you make the conscious decision to transfer TF2 only to area MT--which is essentially what you're arguing--then that decision should be conscious. Rather than just experiencing, isn't it legitimate to consider what your pre-motor cortex is acting out? Is it unreasonable to ask that we be consciencious about the workings of our minds during games?
This isn't to say that EVERY SINGLE TIME you play a game you should write a paper and submit it to a game magazine. I would rather you didn't do that, because I would like to do that, and you would be competing, and, yannow, capitalism.
This is just to say that it's reasonable to become aware of WHICH areas of your brain are affected--because whether you like it or not, your brain ACTIVELY practices killing. I'm not putting a moral label on that. I personally believe that's a good thing sometimes. I'm saying "Know thyself, brain-flesh-meatbag, and have fun playing."
So have fun. BTW, who's your favorite TF2 character? I am pretty much in love with the Scout.