There are lots of gaming peripherals out there, and some of them can get really, really expensive. Hell, I once reviewed a racing wheel, pedals, and shifter set that goes for about $1,200. Even something as simple as a mouse or keyboard can cost you hundreds. When it comes to more creative peripherals like the OCZ Neural Impulse Actuator or some hardcore hydraulic sim systems, the sky is the limit.
This is probably the most expensive peripheral ever, given that it’s made up of tons of extremely expensive, university-grade research equipment and an actual live person. Researchers at the University of Washington used electroencephalography (EEG) and transcranial magnetic stimulation (TMS) to read when a person defending a virtual city from a flying, missile-launching pirate ship (why the hell not?) wanted to fire her cannon. The person playing thought about moving her hand, and because of that and some science and crap, a person in an entirely different room involuntarily twitched and activated a track pad that sent a message to the game that fired the cannon.
I wonder if the latency is better or worse than a wireless mouse?