"For very simple things like going from thinking about your arm to actually moving your arm, it's a pretty straightforward system, and we know what the connections are, " Dr. Provencio said.

WSJ: Obama Gives Details of Brain-Research Project

But, of course, it wasn't designed to just be fun -- it's about comfort and not keeping your arm or hand still for long periods of time.

ENGADGET: Smartfish Whirl Mini Notebook Laser Mouse review, now on sale for $50