Mind control video games

Bah, humbug, how can they work on controlling computer games with people's minds when I still can't stand up stright after 18 pints of guinness I'll never know. So how does a teenager move video icons just by mind power? I think the trick is in the fact that they hooked him up and effectively trained the machine to learn what his brain wanted to do before actually implementing a reader type thing. Well that was a real scientician style sentence so read the damned article yourselves fools.