Device allows paralyzed people to "talk" with their brains.

A new device from Hitachi allows severely paralyzed people to "talk" via measurements of changes in their cerebral blood flow. The device, called "Kokoro Gatari" (Mind Talk), aims to help those with Lou Gehrig's disease communicate, and will be presented at a symposium on Sunday. Cerebral blood flow increases when people intentionally think about something. The doctor who invented this device instructs patients to do math calculations in their head when they want to say "yes" and to relax their thoughts when they want to say "no." Full story here.