Eight years after being paralyzed, a man can move his own arm again. Bill Kochevar was paralyzed from the neck down in a bike accident. Now, with a new mind-controlled prosthetic, he can move his own arm with his thoughts. The prosthetic works thanks to implanted sensors in his motor cortex and 36 electrodes in his arm. Signals from his brain trigger the implants, which send the signal to a computer that decodes the movements, and stimulates the electrodes in his arm. This completely circumvents his spinal injury. He still has to have robotic help to support his arm, but he’s able to…

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