Brain implants restore speech for people with paralysis

Casey Harrell of the United States began regaining his ability to speak using a brain implant after losing his voice to amyotrophic lateral sclerosis, or ALS.

Harrell participated in a clinical trial at the University of California, Davis, where surgeons implanted devices on his brain’s speech motor cortex. These devices detect electrical signals and translate them into words, allowing Harrell to communicate for up to 14 hours daily and produce nearly 2 million words.

Researchers are also developing more portable and advanced brain-computer interfaces. A neurosurgeon at the University of Michigan recently implanted a cortical module in another patient, aiming for real-time speech restoration. Paradromics, a neurotechnology company based in Texas, created the implant, which sends signals to a receiver on the chest and then outputs sound through speakers.

Scientists hope to move beyond simply restoring words to also capture the nuances of speech, like pitch, emotion, and even gestures, to allow for more natural and complete communication. While challenges remain regarding long-term reliability, cost, and accessibility, the progress offers hope for people with conditions like ALS, stroke, paralysis, cerebral palsy, and Parkinson’s disease who have lost the ability to speak.