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I'm curious - does taking a signal straight from the brain reduce reaction times?

Is there a big loss of time sending the signal down to the arm, or is the reaction time mostly cognitive anyway?

Yes. Nerve signals travel at about 50-60 m/s through the limbs, so it takes about 20-30ms for a signal to travel from brain to the hand muscles.

Still better than Sonos Multiroom Speaker sync (70-75ms).

So Neuralink have a large secondary market of FPS players!

And about to be incarcerated cyberpunk guys.

Primary being the army who wants soldiers to quick-fire real guns