Experimental devices that read brain waves are enabling paralyzed people to use computers, and may even help them walk again. In 2004, surgeons implanted 96 electrical sensors into the brain of 25-year-old Matt Nagle, allowing him to use a detached robotic arm to move a mouse cursor just with his thoughts. Sensors only slightly thicker than a single human hair can be inserted into the skull and sit on top of the brain, picking up nerve impulses and relaying them to prosthetics. And Intel Corp. believes that we could all be controlling our computers with our brains by 2020 with brain implants that sense thoughts.
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