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Neuralink’s first publicly identified trial participant, Noland Arbaugh, reported losing cursor control a few weeks after receiving the company’s brain-computer interface implant. Neuralink said some electrode-bearing threads had retracted, reducing the number of effective electrodes. The company adjusted its signal-processing software, and Arbaugh said performance improved. Neither account said the implant as a whole came out, and public reporting did not establish that the threads were physically repaired.
What happened to the Neuralink implant?
Neuralink’s May 2024 update said that, in the weeks after Arbaugh’s surgery, “a number of threads retracted from the brain,” causing a net decrease in effective electrodes. The statement describes a loss of usable electrode signals; it does not say the entire implant detached. Fierce Biotech reported the company’s account, and the original company update is available at Neuralink.
Arbaugh told WIRED that he noticed a change about three weeks after surgery: “I could tell right away that something was wrong. I just started losing control of the cursor.” At first, he suspected a software change. He said the system took roughly two weeks to recalibrate to his previous cursor speed, and that performance continued to improve afterward. WIRED’s May 2024 interview records his account.
How many threads retracted?
The public company statement described “a number” of threads but did not give a percentage. Scientific American reported that Arbaugh said Neuralink’s signal analysis indicated that 85 percent of his threads had retracted. That figure is his reported account, not a percentage stated in the company’s public update or an independently published clinical measurement. Scientific American’s June 2024 report explains the distinction.
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For scale, the N1 implant was reported as having 1,024 electrodes distributed across 64 threads. Those design figures do not establish how many electrodes remained effective in Arbaugh’s case. Fierce Biotech’s report gives the device figures.
Did Neuralink fix the problem?
Neuralink said it modified its recording algorithms and increased the system’s sensitivity to signals from the remaining electrodes; it reported that performance subsequently improved. Arbaugh also described software adaptation and a return of much of the functionality. In a December 2024 interview, he recalled the company changing its approach to register groups of neurons rather than individual neuron spikes. These accounts describe software and signal-processing changes, not physical repair or replacement of retracted threads. Big Technology’s December 2024 interview provides his later recollection.
Arbaugh also described a workaround for some tasks: holding the cursor over an item instead of clicking it. That could help with particular interactions, but it is not evidence that every function or electrode returned to its prior state. Scientific American reported the workaround.
Why was Arbaugh alarmed?
Arbaugh said he feared that more threads might retract and the implant could stop working. In the May 2024 WIRED interview, he put it plainly: “Yeah, I’ve had fears about that.” He also said Neuralink told him it saw no evidence of continued retraction, and that he was no longer worried at the time of that interview. These are statements about his reaction and the information he said he received in 2024; they do not establish his current status.
In the later Big Technology interview, Arbaugh recalled thinking the news meant he was out of the study and describing a loss of cursor control. He also attributed the retraction partly to greater-than-expected brain motion. That explanation is his recollection, not an independently confirmed cause.
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Arbaugh’s implant was investigational and used in a clinical-trial setting. The system was intended to decode movement signals so he could control a computer cursor; reports described him using it for activities such as games and web browsing. WIRED’s interview describes his use of the system.
As of its June 2024 article, Scientific American reported that no formal scientific report on Arbaugh’s case had been published. It quoted University of Cambridge bioelectronics researcher George Malliaras saying, “We have to wait until papers are published with data.” The available public accounts did not establish exactly why or how far the threads moved, whether their positions continued to change, or whether the remaining threads had stabilized. They also did not establish a specific medical injury caused by the retraction or quantify a health risk for this individual.
This episode is one participant’s reported experience, not a measure of failure rates for Neuralink or brain-computer interfaces generally. The broader field includes multiple approaches, and the Associated Press reported in January 2025 that Neuralink’s advantages over alternatives had yet to be demonstrated. The Associated Press report provides that wider context.
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