BrainGate is a brain-computer interface developed by Cyberkinetics that allows paralyzed people to control external devices with their brain signals. It consists of a tiny electrode array implanted into the motor cortex that monitors brain activity and converts it into commands to control a cursor on a screen or prosthetic limb. The first clinical trial involved Matthew Nagle, a quadriplegic patient who was able to control a computer cursor and prosthetic hand using only his brain signals picked up by BrainGate. While still being improved, BrainGate has given paralyzed individuals new abilities to communicate and interact with the world independently.