The present invention relates to monitoring and altering an individual's brain state. More particularly, the present invention is directed to the continuous real-time alteration of the brain state from a less desirable to a more desirable state through the use of multiple magnetic fields and a system monitoring the effect of the fields.
http://www.google.com/patents/US6488617

Maybe this is why digital tvs and game consoles have cameras, for the feedback loop back to central brain control?