…Temporarily, at least. Via ScienceDaily:
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Sustained changes in the region of the brain associated with cognitive function and emotional control were found in young adult men after one week of playing violent video games, according to study results presented by Indiana University School of Medicine researchers at the annual meeting of the Radiological Society of North America.This is the first time the IU researchers, who have studied the effects of media violence for more than a decade, have conducted an experimental study that showed a direct relationship between playing violent video games over an extended period of time and a subsequent change in brain regions associated with cognitive function and emotional control.
The controversy over whether or not violent video games are potentially harmful to players has been debated for many years, even making it as far as the Supreme Court in 2010. There has been little scientific evidence demonstrating that the games have a prolonged negative neurological effect.