Unexplainable Casey gets his voice back
25 snips
Mar 25, 2026 
LaVonna Saxon, Casey Harrell’s wife and caregiver, reflects on their life, parenting, and caring through illness. Casey Harrell, an environmental advocate with ALS, regained speech using an implanted brain–computer interface. They discuss implant surgery, training AI to decode intended speech, emotional family moments, and the everyday changes when voice returns.
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How Casey Regained Speech With Brain Electrodes
- Casey lost his natural voice to ALS and later had 256 electrodes implanted in his motor cortex to restore speech via AI decoding.
- The system decodes his intended speech from motor cortex signals and plays a synthesized voice so he can speak again outside research sessions.
Brain Decoding Is Faster Than Typing With Eyes
- The UC Davis system is described as near-instantaneous and highly accurate compared with slow eye- or muscle-based typing systems.
- Researchers report ~97% accuracy, enabling real-world use by Casey when researchers aren't present.
Live Transcript And Eye Gaze Let Casey Edit Words
- During the interview Casey's intended speech appeared as live text on a second screen which he corrected with eye gaze before playing the synthesized voice.
- Long pauses Julia experienced were often Casey composing, correcting via gaze, or waiting for the system to produce speech.