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Threads of Neuralink’s brain chip have “retracted” from human’s brain It's unclear what caused the retraction or how many threads have become displaced.

It's unclear what caused the retraction or how many threads have become displaced.

On January 28, the company announced that it has surgically implanted its brain-computer interface into its first clinical trial participant, 29-year-old Noland Arbaugh, who developed quadriplegia after a 2016 diving accident. It remains unclear why the threads moved from their placement, but one hypothesis that sources told the Journal is that there was air trapped inside Arbaugh's skull after the surgery, a condition called pneumocephalus. The Journal reported that the company has told the Food and Drug Administration—which regulates clinical trials and granted approval for Neuralink to test its device in humans —that it believes it has fixes for the problem.

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