Paralysed man feeds himself using computer-brain interface
A computer-brain interface has allowed a paralysed man in Cleveland to feed himself mashed potatoes for the first time in eight years.
The device is capable of reading his thoughts and sending signals to move muscles in his arm, US researchers said on Tuesday.
The research is the latest from BrainGate, a consortium of researchers testing brain-computer interface technology designed to give paralysed individuals more mobility. Prior tests of the technology allowed users to move a robotic arm or a cursor on a keyboard using their thoughts.
The team at Case Western Reserve University and the Cleveland Functional Electrical Stimulation Center used the brain-computer interface and an electrical stimulation system that allowed Bill Kochevar, 56, to control his own arm.
To achieve this, the team implanted two sensors, each about the size of a small tablet, loaded with 96 electrodes designed to pick up nerve activity in the movement centres of the brain.
The sensors record brain signals created when Kochevar imagines moving his arm, and relay them to a computer. The computer sends the signals to the electrical stimulation system, which directs impulses through about 30 wires implanted in muscles in Kochevar’s arm and hand to produce specific movements.
Kochevar, who was paralysed below his shoulders in a cycling accident eight years ago, first learned to use the system to move a virtual-reality arm on a computer screen. He accomplished that on the first day of trying, said Case Western’s Robert Kirsch, the study’s senior author.
For the movement phase of the trial, Kochevar had to go through 45 weeks of rehabilitation to restore muscle tone that had atrophied over the years of inactivity.
Using the brain interface system, he can now move each joint in his right arm individually, just by thinking about it. To accomplish tasks such as drinking through a straw, or scratching his face with a dry sponge, Kochevar is aided by an arm support, a device he also controls with his thoughts.
Kochevar said the chance to do simple things for himself has been “better than I thought it would be”.
For the moment the system is experimental only, but the study shows such a system is feasible, Kirsch said.
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