THOUGHT CONTROL COMPUTERS
A neurologist at the New York State Department of Health is investigating 
how a brainwave signal, known as the mu rhythm, can control a computer 
cursor, moving it up if the signal is significantly higher voltage than the 
median and down if it is lower. In trying to manipulate his own mu, he found 
the cursor went up if he thought about smiling, chewing gum, swallowing or 
blinking his eyes. If he frowned or thought about squeezing a pen, the 
cursor went down. A test of 25 disabled volunteers resulted in 75% to 80% 
gaining up-and-down control of the cursor within a few hours. (Technology 
Review 10/94 p.19)