The document discusses intermanual referral of sensations and extinction of pain in peripheral and central lesions of the somatosensory system. It describes a study of 8 patients with brachial plexus lesions, amputations, and strokes. The study found that intermanual referral of sensations and extinction of pain occurred immediately in amputation and brachial plexus lesions, but after a delay in strokes. Referral was spatially organized in brachial plexus lesions but not in other conditions. The neural mechanisms behind these perceptual alterations are still unclear.