<prompt> A man loses his right hand in a farm accident, four year later; he has episodes of severe pain in the missing hand phantom limb pain. A detailed PET Scan study of his cerebral cortex might be expected to showExpansion of the right hand area in his right somatic sensory area I SIExpansion of the right hand area in his left SIProjection of fiber from neighboring sensory areas into the right hand area of his right SIProjection of fiber from neighboring sensory areas into the right hand area of his left SI  <response>: Ans. d Projection of fiber from neighboring sensory areas into the right hand area of his left SIRef: Ganong, 25th edp.169Cortical plasticityCortical areas become weak with disuse and strong with useIf a digit is amputated, cortical representation of the neighboring digits spreads and occupies the cortical area of the amputated digit. There is tremendous remapping of the somatosensory cortex This is one explanation for phantom painSuch plastic changes happen for one sensory modality to another if that sensory modality is not use 