I've gota couple of ECG machines in the basement, the hardest part of getting them going is to get a good electrical connection to the skin. The thought albiet slim of a wire slipping and getting a nice shock has kept me from firing them up.
Now what about a EEG machine?

?!!
I saw a show last night on new tech & toys, and they had this 2 person game, with a small strap that went around your forhead. It measured alpha and theta waves, to tell how relaxed you were.
The players sat on oposite sides of a table, and there was a ball in the middle. Using a magnet uinder the table on a guide, if you were more relaxed than the other player, the ball would roll towards them, if they were more relaxed it would roll towards you.... Kinda like a mental relaxation tug of war.
I must build one....... The mechanics and pickup are the easy part, I just suck at the programming... must learn....
sd