So far he hasn't been able to help a paralyzed person gain control of more than two lost functions.

FORBES: Technology

Scans might be used someday to tell when pain is hurting a baby, someone with dementia or a paralyzed person unable to talk.

WSJ: Doctors use brain scans to 'see' and measure pain

"Just looking at the brain, you wouldn't know whether the person was paralyzed or not, " he says.

FORBES: Technology

He discovered that if a person who has long been paralyzed thinks "move my arm to the left, " the region in the brain responsible for moving arms--the motor cortex--fires away as if everything were connected.

FORBES: Technology