It’s not just Neuralink—several companies are working on brain implants that can help patients communicate with computers using their thoughts. One, Precision Neuroscience, is developing implants to help patients with severe paralysis who can't use their hands or arms to operate a computer. But making an implant that can do this requires a lot of testing. WSJ science bureau chief Jo Craven McGinty recently saw one of those tests. She tells host Alex Ossola about the operation and when brain-computer interfaces might hit the market.

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