Germany built a brain implant that lets locked-in ALS patients communicate at 82 characters per minute using only their thoughts.
For patients with ALS in its final stages, the body becomes a prison. Movement gone. Speech gone. Even eye tracking — the last resort of most communication systems — fails as the disease progresses to complete paralysis. These patients, fully conscious and mentally intact, become unreachable.
Researchers at the University of Tübingen developed a fully implanted brain-computer interface for completely locked-in ALS patients — people with zero muscle control, including eye movement. Two electrode arrays placed on the motor cortex surface record neural signals generated when patients attempt to move. A machine learning decoder translates those signals into yes/no selections on an auditory speller — the patient hears letters and selects by thinking.
A patient identified only as "patient A" — completely locked-in for three years before implantation — used the system to spell out messages to his family, request music, ask for specific foods, and tell his son he loved him. He achieved 82 characters per minute.
His first message after gaining communication was a request to watch a movie with his family.
The system requires no external hardware beyond the implant. No cameras, no eye tracking, no physical movement of any kind. Pure thought, converted to words.
Germany gave voice back to people medicine had given up on communicating with.
Source: University of Tübingen & Nature Communications, 2024
