Non-Invasive Brain-Computer Interface Offers More Control Than Once Thought

A brain-computer interface (BCI) that translates electrical signals detected from the scalp into a user’s commands offers comparable precision, speed and accuracy to systems that rely on electrodes surgically implanted in the brain, researchers at the Department of Health’s Wadsworth Center laboratories have shown.
http://www.sciencedaily.com/releases/2004/12/041208105710.htm