The box tricks the brain into thinking it’s back, and controllable, because the person is told to mirror their phantom limb’s movements to their real arm. The pain disappears right away because the brain thinks the limb is working properly the pain will come back if you only do one treatment, but repeating the treatment reduces both the frequency and intensity of the pain until it’s gone for good. At least, that’s my understanding of it at least that’s what I’m trying to explain.”]
Source: https://gizmodo.com/new-kinect-hack-could-help-relieve-phantom-limb-pain-5883249