While he was implanted, Matt could control a computer "mouse" cursor, using it then to press buttons that can control TV, check e-mail, and do basically everything that can be done by pressing buttons. He could draw (although the cursor control is not precise) on the screen. He could also send commands to an external prosthetic hand (close and open). The results of the study are published in the journal "Nature". Per Food and Drug Administration (FDA) regulations and the study protocol, the BrainGate device was removed from him after approximately one year.