"It's the first time a monkey--or a human--is directly, with their brain, controlling a real prosthetic arm," says Krishna Shenoy, a neuroscientist at Stanford University who was not involved in the research.
People who suffer from strokes or spinal cord injury, or from some neurodegenerative diseases, such as amyotrophic lateral sclerosis (ALS), are often left paralyzed. But their cerebral cortices--the parts of the brain that control movement, planning, and other functions--may remain largely intact. Scientists hope to capitalize on that with the development of brain machine interfaces--devices that convert brain activity into action, such as movement of a cursor on a computer screen.
Two monkeys in the experiment had previously learned to move the robotic arm using a joystick. In the brain wave experiment, their arms were temporarily restrained. Link (with video) -Thanks, Bill!