Implant lets paralysed man 'play guitar'

In a world first, a quadriplegic man can once again move his fingers after a chip was implanted in his brain. Ian Burkhart from Ohio in the US can even move individual fingers to play a guitar-based computer game. The chip reads brain signals, which are interpreted by a computer. It then precisely stimulates his muscles with electricity to restore movement. The researchers hope the technology will eventually help millions of people with paralysis, stroke or brain damage.