While we can't say for sure that videogames, as your grandmother insists, do indeed rot your brain, thanks to research conducted at a variety of Universities around the States we know that better gamers tend to have more gray matter than others -- at least in certain areas. Kirk Erickson, Ann Graybiel, Arthur Kramer, and Walter Boot worked together to form a study in which 39 participants' brains were scanned before those subjects were asked to play a game called Space Fortress (which looks a little like an Atari-era Geometry Wars). Players with larger nucleus accumbens did better learning the game early on, while those with larger caudate nucleus and putamen did
