Brain implants move from lab to living rooms as speech decoding speeds double
This digest was compiled by AI from multiple sources — links to the originals are below.
A 47-year-old ALS patient has used a brain implant at home for two years, producing over 183,000 sentences at 56 words per minute. The system, published in Nature Medicine in June 2026, achieved over 99 percent accuracy in controlled testing. Only 67 people worldwide have received chronic brain implants since 1998, and no device is approved for sale.
Key Facts
- Casey Harrell, 47, with ALS, used a brain implant at home for over 3,800 hours, producing 183,000 sentences at 56 words per minute.
- The 2026 Nature Medicine study reported word accuracy above 99 percent in controlled testing, nearly double the speed of the 2024 system.
- A review in Nature Reviews Bioengineering counted 67 participants across 21 research groups worldwide from 1998 through December 2023.
- Neuralink had 21 participants enrolled in trials worldwide as of January 2026, with no serious device-related adverse events recorded.
Speech Decoding Performance
Casey Harrell, 47, has ALS and received four microelectrode arrays in his brain's precentral gyrus from UC Davis neurosurgeon David Brandman in 2023. Over two years, Harrell used the system at home for more than 3,800 hours, producing over 183,000 sentences at an average of 56 words per minute. The 2026 Nature Medicine paper by Brandman, Sergey Stavisky, and colleagues reported word accuracy above 99 percent in controlled testing. An earlier version described by Nicholas Card and colleagues in the New England Journal of Medicine in 2024 held 97.5 percent accuracy over 8.4 months at about 32 words per minute.
Clinical Trial Landscape
A review by K. Michelle Patrick-Krueger, Ian Burkhart, and Jose Contreras-Vidal in Nature Reviews Bioengineering counted 67 participants across 21 research groups from 1998 through December 2023. No brain-computer interface device has been approved for sale by any regulator as of the review period. Neuralink reported 21 participants enrolled in trials worldwide as of January 2026, two years after its first human implant. Neuralink participants have driven cursors, played games, and steered powered wheelchairs, all under investigational status.
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Brain implants move from lab to living rooms as speech decoding speeds double
