Abstract
The brain needs body image to plan movements. Our recent studies use an ischemic block of a limb to study the mechanisms of changes in body image. First, if the fingers, wrist, elbow, ankle, and knee are extended before and during the block, then the perceived limb is flexed at the joint and vice versa. The final position of the phantom limb depends on its initial position. Second, the perceived size of the hand increases gradually as anesthesia develops. The start of these perceptual changes occurs when input from large-diameter sensory nerve fibers is declining. Third, at the end of the block, when participants are allowed to see their foot, its perceived position reverts to that indicated by them earlier.
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