The subject of the research, carried out by scientists at the University of California, Irvine, had been paralyzed for five years. The work began with a stint of mental training designed to reengage the brain’s walking ability, which saw the subject don an electroencephalogram (EEG) cap (a piece of headwear fitted with electrodes that monitor the brain’s electrical impulses). The man was first made to control an avatar in a virtual environment, which was then followed with physical training to build up the strength of his leg muscles.
Source: Paralyzed man uses own brainwaves to walk again – no exoskeleton required
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