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Noland Arbaugh’s motor cortex still generates the same population-level action…

2026-05-10 · 11:29 UTC ·@aakashgupta ·2 min read

Brief

Noland Arbaugh’s Neuralink N1 implant reads motor commands the brain still produces: the same motor-cortex neurons fire 50–100 ms before movement and Neuralink captures those spikes. The device (1,024 electrodes on 64 polymer threads, 3–5 mm depth, 20,000 Hz sampling) survived an 85% thread retraction by relying on a rewritten ML decoder that restored and exceeded prior throughput, underscoring decoder advances over raw electrode count and continuing a line from the 2004 Utah array and BrainGate work.

Why it matters

Noland Arbaugh’s motor cortex still generates the same population-level action potentials when he imagines moving his right hand—neurons fire 50–100 ms before any muscle would have moved—and Neuralink records those outgoing motor commands.

Key details

  • Neuralink’s N1 implant has 1,024 electrodes on 64 polymer threads inserted 3–5 mm into motor cortex; each electrode records spikes from neurons within ~50–100 µm, the chip samples at 20,000 Hz per channel, and an ML decoder maps firing patterns to cursor velocity.
  • About one month after surgery Neuralink reported 85% of Arbaugh’s threads retracted (≈1,024 → ~150 working electrodes); after rewriting the decoder his bits-per-second exceeded the pre-retraction baseline, and Arbaugh reportedly uses the implant to play video games, earn a 4.0 GPA, run a business, give paid talks, and write a book.
Source evidence

Move your right hand right now. The brain region that just fired is the same one Neuralink is reading in Noland Arbaugh.

His motor cortex doesn't know the spinal cord is severed. When he imagines moving his hand, the same population of neurons fires that fired before his diving accident. 50 to 100 milliseconds before any muscle would have moved, those neurons send action potentials toward the spinal cord. The cord no longer carries the signal. Neuralink reads it on the way out.

The N1 implant has 1,024 electrodes spread across 64 polymer threads thinner than a human hair, embedded 3 to 5 mm into the motor cortex. Each electrode records voltage spikes from neurons within 50 to 100 microns. The chip samples at 20,000 Hz per channel and an ML decoder maps the firing pattern to cursor velocity.

Here's the part that matters. About a month after surgery, Neuralink disclosed that 85% of Arbaugh's threads had retracted from his cortex. He went from 1,024 electrodes to roughly 150. He kept his cursor control. Neuralink rewrote the decoder, and his bits-per-second eventually exceeded the pre-retraction baseline.

That tells you where the progress is. Matthew Nagle controlled a cursor with a 96-electrode Utah array in 2004. BrainGate participants have been typing, moving robotic arms, and playing video games for two decades. The hardware jump from 96 to 150 working electrodes is incremental. The decoder jump is where the curve bends.

Neuralink's actual contributions are specific. Robotic implantation. Wireless link. Fully implanted form factor. A decoder that kept performing when 85% of the hardware failed. The chip intercepts motor commands the brain was already producing, and the algorithm gets sharper at reading them.

The 4.0 GPA, the speaking career, the book are all downstream of one thing. Arbaugh moves a cursor using the same neural population he used before he was paralyzed. That's the trick the field has been refining since the Utah array hit human cortex in 2004.

X Freeze (@XFreeze)

Noland Arbaugh’s life has been completely transformed

“I can control a computer with my thoughts”

As the first human to receive a Neuralink brain implant, the man who was once paralyzed after a diving accident is now:
• Playing video games for hours using only his mind
• Earning a 4.0 GPA while studying neuroscience in college
• Running his own business
• Building a thriving speaking career with paid keynotes and global appearances

He’s traveling the world, inspiring audiences, and even writing a book - all powered by a brain chip

What used to be science fiction is now reality

Neuralink is not just restoring lost abilities - it’s unlocking the next chapter of human potential

Video

— https://nitter.net/XFreeze/status/2053019245571703032#m