A Japanese researcher, Akio Mori, from the Nihon University’s College of Humanities and Sciences, claims to have found a link between the playing of video games and the balance of activity in the brain. It is also claimed that this effect can cause behavioural changes, such as lack of concentration, difficulty with social association, and short temper. These effects are also thought to be, to some extent, nonreversible.

I’m guessing the results are different if you play classical music in the background.