Answer:
he has fantom pain and that he isn't crazy. when he lost his arm below elbow, the pathway to hand had been severed and the brain still thinks the pathway is going to his hand
Step-by-step explanation:
Your uncle still has the surviving parts of the sensory pathway that once served the entire arm. This mayinclude the primary sensory neurons, since the severed axons could have regenerated (but even if thesecells degenerated, the remainder of the pathway did not). Anything that stimulates the sensory nerve inthe stump may cause signals to go to the area of the cerebral cortex that once received inputs only fromthe hand. Your uncle is not crazy, rather he is experiencing phantom limb pain, which is very real. Thisphenomenon illustrates labeled line coding and coding of stimulus location.