Evidence for PCT?
http://www.xconomy.com/san-francisco/2010/12/13/can-tibions-bionic-leg-rewire-stroke-victims-brains/?single_page=true
“There are all these great technologies, but they basically set the trajectory, so once you press the ‘Go’ button, all you can change is the speed, not the path,” he says. “The neuroplastic effect is not seen, because the patient is not required to do anything. For robotic rehabilitation to deliver on its promise is going to require an intention-based device.” (emphasis added)