Brain Implant Lets ALS Patient Casey Harrell Speak 2 Million Words at 56 WPM
Updated
Updated · ScienceAlert · Jun 17
Brain Implant Lets ALS Patient Casey Harrell Speak 2 Million Words at 56 WPM
3 articles · Updated · ScienceAlert · Jun 17
Summary
47-year-old Casey Harrell, who has advanced ALS and severe paralysis, now uses an experimental brain-to-text implant to communicate independently at home in a digital version of his own voice.
Electrode arrays detect brain activity when he attempts to speak, and an external decoder turns those signals into real-time text that he selects with eye gaze and a thought-controlled click.
Over nearly two years, Harrell has produced more than 183,000 sentences and nearly 2 million words, logging 3,800 hours across more than 400 days with about 92% reported accuracy.
The system now lets him send messages, browse the internet, keep full-time work and choose a privacy mode that prevents some sessions from being stored for model training.
UC Davis researchers said the BrainGate 2 trial suggests brain-computer interfaces may be moving beyond lab proof-of-concept toward longer-term, real-world use for 26 enrolled participants with severe speech or hand impairments.
This technology let a paralyzed man keep his job. Will brain implants end disability or create a new digital divide?
AI can now decode thoughts into text. Who is liable when this technology makes a costly mistake?
As China's BCI tech targets 2027 deployment, can the U.S. maintain its lead in this new technological frontier?
Restoring Voices: How UC Davis’ Brain-Computer Interface Achieved Real-World, Natural Communication for ALS Patients
Overview
The UC Davis Brain-Computer Interface (BCI) system represents a major breakthrough in assistive technology, enabling people with severe communication impairments to interact with the world in new ways. As the first 'power user,' Casey Harrell demonstrates how the BCI overcomes previous barriers, allowing for both digital and in-person conversations with a level of independence not seen before. This leap from older, more limited technologies highlights the system’s immediate impact, empowering users to express themselves more fully and connect with others, ultimately transforming their daily lives and social integration.