A study was conducted by the head of radiology at Indiana University School of Medicine, Dr. Vincent Mathews. In it, 44 subjects were randomly assigned to play either a violent (Medal of Honor: Frontline) or nonviolent (Need For Speed:Underground) video game for 30 minutes. Then, the subjects were given MRI scans and monitored while working on tests of inhibition and concentration.
Interesting. Nice to see a study that focuses on actual effects rather than scare tactics and cultural agendas.