This is interesting as it bypasses the spinal column. I'm not clear on how the brain implants communicate with the electrodes in his arm. Found a youtube video that clarifies that point.
http://www.news-medical.net/news/20170329/Man-with-quadriplegia-uses-implanted-technologies-to-restore-arm-and-hand-movements.aspx
https://www.youtube.com/watch?v=YFoUJ7sx0pQ
http://www.news-medical.net/news/20170329/Man-with-quadriplegia-uses-implanted-technologies-to-restore-arm-and-hand-movements.aspx
https://www.youtube.com/watch?v=YFoUJ7sx0pQ
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