Vertebrate Physiology

A recent article in Scientific American describes one of the treatments for patients experiencing phantom limb pain. One solution mentioned was to thrust a screw driver into the apparent trouble spot. The amputee would place his prosthetic leg where his own leg used to be, and stab at it with his screwdriver. The claim is that as long as he could see this, the pain would be relieved.
There are other solutions mentioned here, in particular, the use of mirrors.