Maybe not the same source, but V.S. Ramachandran's book, Phantoms in the Brain, covers his use of a set-up like that to help patients recover from phantom limb

Maybe not the same source, but V.S. Ramachandran's book, Phantoms in the Brain, covers his use of a set-up like that to help patients recover from phantom limb syndrome. Shockingly effective for what is, essentially, just an illusionist's trick.