Researchers from the Université de Montréal have published a study that found certain types of video games resulted in the loss of grey matter in the brain, while other types of video games resulted in an increase. Specifically, the study claims that gamers who frequently play first person shooter type video games like Call of Duty, Killzone,

Source: Hot Hardware – Researchers Claim FPS Video Games Can Rot Your Brain While VR Stimulates And Grows It