Human Hands Shake 40 Microns; Neuralink's Needle Is 24—Why Robots Must Do It
aakashgupta · x · 2026-11-01
Why no surgeon can do what Neuralink does: even the steadiest hands—eye surgeons'—drift 40 microns, while Neuralink's needle tip is just 24 microns wide. The brain also moves with every heartbeat: first patient Noland Arbaugh says the team expected 1mm of movement but it was closer to 3mm—about 125 needle-widths of motion per second. The post uses these figures to explain why the needle insertion must be robotic.
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