Six years after a diving accident left him paralysed from the chest down, Keith Thomas can now feed himself, drink from a cup, and feel the touch of his family and pets. This breakthrough is the result of a revolutionary "double neural bypass" system that uses a brain implant to reconnect his mind with his limbs. More surprisingly, researchers have discovered that the technology has helped his nervous system partially heal itself, allowing him to maintain these improvements even when the system is turned off.
Thomas, a 48-year-old from Long Island, New York, joined a clinical trial at the Feinstein Institutes for Medical Research after his accident in 2020. In 2023, surgeons implanted microchips into his brain. These electrodes detect his intentions to move and send those signals to a computer, which uses artificial intelligence to interpret them. The commands are then routed to electronic splints on his arms and hands to stimulate movement.
But the system does not just send signals out—it also brings them back. Sensors placed on his fingers detect pressure and send electrical signals back to the sensory areas of his brain. This allows Thomas to feel the texture and resistance of objects. For the first time in years, he has been able to hold his sister's hand and feel the fur of his pet dog.
The most astonishing discovery came when the research team had to temporarily halt the brain stimulation due to an unexpected fire in their building. Instead of losing the progress he had made, Thomas continued to show improvements in strength and sensation during the three months the device was turned off. Doctors believe this is due to neuroplasticity—the brain’s ability to reorganise itself and form new neural connections. By repeatedly using the device, Thomas's nervous system appears to have strengthened surviving nerve pathways that were previously too weak to transmit signals.
While the results are highly encouraging, scientists caution that this is currently a single case study. Because spinal cord injuries vary greatly, further trials with more participants are needed to determine if this success can be replicated. Nevertheless, for Thomas, the experience has redefined what is possible. "When I first felt it, it was amazing," he recalled of the moment his sensation returned.