A New York man paralysed from the chest down can now feel his dog's fur — thanks to a chip in his brain that rewires around his injury.
On a July afternoon in 2020, Keith Thomas dived into a swimming pool in Massapequa, New York, and broke his neck. He blacked out. When he opened his eyes, there was a helicopter on his front lawn. The next morning, he could not move at all.
He was 42 years old, and his spinal cord had become a wall between his brain and his body. Then something remarkable happened. In October 2021, Thomas joined a clinical trial at the Feinstein Institutes for Medical Research, part of New York's Northwell Health. Surgeons implanted tiny electrodes directly into his brain.
These electrodes listen for the electrical whisper of an intended movement — the thought "lift my arm" — and then route that signal around the damaged spinal cord and straight to the muscles themselves. Pressure sensors fitted to his fingers and thumb complete the circuit, sending signals back up to his brain to recreate the feeling of touch. The researchers call this a "double neural bypass," and it is, in effect, a detour around the broken road. What nobody expected was what happened next.