What's behind the phenomenon of 'gamer brain'

The Guardian 

The draw of the impossible Baby Steps. The draw of the impossible Baby Steps. If you've ever refused to knock down a game's difficulty level, or chased a purposefully pointless achievement, you might have this pernicious but pleasurable affliction Don't get Pushing Buttons delivered to your inbox? S tudies on gaming's effect on the brain usually focus on aggression or the cognitive benefits of playing games. The former topic has fallen out of fashion now, after more than a decade's worth of scientific research failed to prove any causative link between video games and real-world violence.