Only about 15 percent of the electrode-bearing threads implanted in the brain of Neuralink's first human brain-chip patient continue to work properly, according to a report from The Wall Street Journal. The remaining 85 percent of the threads became displaced, and many of the threads that were left receiving little to no signals have been shut off.
In a May 8 blog post, Neuralink had disclosed that "a number" of the chip's 64 thinner-than-hair threads had retracted. Each thread carries multiple electrodes, totaling 1,024 across the threads, which are surgically implanted near neurons of interest to record signals that can be decoded into intended actions.
Neuralink was quick to note that it was able to adjust the algorithm used for decoding those neuronal signals to compensate for the lost electrode data. The adjustments were effective enough to regain and then exceed performance on at least one metric—the bits-per-second (BPS) rate used to measure how quickly and accurately a patient with an implant can control a computer cursor.
In an interview with the Journal, Neuralink's first patient, 29-year-old Noland Arbaugh, opened up about the roller-coaster experience. "I was on such a high and then to be brought down that low. It was very, very hard," Arbaugh said. "I cried." He initially asked if Neuralink would perform another surgery to fix or replace the implant, but the company declined, telling him it wanted to wait for more information. Arbaugh went on to say that he has since recovered from the initial disappointment and continues to have hope for the technology.
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