Abstract
Two conditions of exposure to prism rearrangement were used to explore specificity of visuo—motor adaptation. In one condition subjects viewed, in sequential alternation of one minute periods, the movements of one arm through base right prisms and those of the other arm through base left prisms for a total of 20 min. In the second condition subjects viewed the movements of only one arm for one minute periods followed by closing the eyes for the next, alternating between viewing arm movements and closing the eyes for a total of 20 min. The magnitude of postexposure sensorimotor changes following the alternating limb-exposure condition was equivalent and opposite in direction in each limb. Unilateral exposure generated commensurate sensorimotor changes in responses entailing the exposed arm. These results show that prism-mediated visual reafference from arm movements acts to recalibrate target-directed orientations of that arm only, and does not interact, or interfere with, recalibration of directed orientations of the other limbs.
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