# BrainGate2 implant lets a man with ALS talk for a prolonged period, Nature Medicine reports

Canonical page: https://technooptimist.io/stories/braingate2-implant-lets-a-man-with-als-talk-for-a-prolonged-period-2f266957
Date: 15 Jun 2026
About: [BrainGate consortium](https://technooptimist.io/companies/braingate-consortium.md) · [BrainGate2 clinical trial (speech neuroprosthesis)](https://technooptimist.io/neurotech/braingate2-speech-trial.md)
Original source: https://health.ucdavis.edu/news/headlines/brain-computer-interface-enables-independent-accurate-communication-for-man-living-with-als/2026/06

A 47-year-old man with ALS, Casey Harrell, used the BrainGate2 brain-computer interface to speak clearly and without assistance over a prolonged period. The results, from one participant, were published in Nature Medicine on 15 June 2026.

## Key facts

- Harrell rated 92% of sentences as accurate or mostly correct.
- In controlled tests with a 125,000-word vocabulary, the system scored over 99% word accuracy.
- The findings rest on a single participant; the trial is still enrolling.

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