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Amputation of a limb leads to significant reorganization of the primary somatosensory cortex, that part of the brain which processes touch- and pain-related information. The cortical region normally devoted to the amputated body part is suddenly deprived of sensory inputs, but because the adult brain is plastic, it does not lay dormant - the area assumes other functions, and begins to process sensory information from other parts of the body. (Neurophilosophy_

brain neurophilosophy amputee grue cogsci

Ehrsson et al. 131 (12): 3443 -- Brain

extended-mind amputee plasticity