100 people globally use brain-computer interfaces in clinical trials. Scaling up commercially is on the horizon

Implanted BCIs [brain-computer interfaces] are electrodes put in paralyzed people’s brains so they can use imagined movements to send commands from their neurons through a wire, or via radio, to a computer. In this way, they can control a computer cursor or, in few cases, produce speech.

[A] small group of companies … are actively recruiting volunteers to try BCIs in clinical trials. They are Neuralink, backed by the world’s richest person, Elon Musk; New York–based Synchron; and China’s Neuracle Neuroscience. … [T]he first time a person controlled a computer cursor from a brain implant was in 1998. That was followed by a slow drip-drip of tests in which university researchers would find a single volunteer, install an implant, and carry out studies for months or years.

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