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A preliminary study in Australia has shown the promise of brain-computer interfaces in treating stroke victims. The research, conducted by the University of Adelaide, showed that a stroke victim showed a 36% percent improvement in a stroke-damaged hand, after 5 hours of treatment. Brain-computer interfaces are devices which can translate signals from the brain into computer commands. Professor Derek Abbott told Dan Damon how it works. (Picture: Artist's depiction of brain covered in sensors. Credit: Getty Images)