“Similar technology is already available, like that from California company NeuroSky that can turn brainwaves and emotional states into actions. So far, it is being used in several games that let a player wearing a headset to use the power of thought to control a fan, move a ball around an obstacle course, play mental tug of war or blow stuff up.”

http://www.nydailynews.com/money/2010/04/08/2010-04-08_mindreading_brain_scans_debut_in_nyc.html