Asymmetric generalization between the arm and leg following prism-induced visuomotor adaptation |
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Authors: | Douglas N Savin Susanne M Morton |
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Institution: | (1) Department of Physical Therapy and Rehabilitation Science, University of Maryland School of Medicine, Allied Health Building, 100 Penn St. Rm. 115, Baltimore, MD 21201, USA;(2) Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, MD, USA |
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Abstract: | We have previously shown an asymmetric generalization following a prism-induced visuomotor adaptation. Subjects who adapt
to laterally deviating prism lenses during walking show a broad generalization to an arm pointing task, while subjects who
adapt to prisms during arm pointing do not show generalization to walking. It is not known whether this broad generalization
persists with other movements outside of walking or what specific features of the walking task, e.g. lower extremity involvement,
allow it to be so broadly generalizable. In the current study, we tested healthy adult subjects performing one of three forms
of prism adaptation and subsequently measured generalization. In Experiment 1 we tested whether a seated arm pointing prism
adaptation would generalize to the leg. In Experiment 2 we tested whether a seated leg pointing prism adaptation would generalize
to the arm. In Experiment 3 we tested whether standing influenced the extent of generalization from leg to arm. Results were
surprising. We found a clear and consistent generalization from arm to leg, but much less so from leg to arm during either
the seated or the standing task. These findings indicate that prism adaptations during arm movements are not limb-specific,
as has been previously suggested. Further, the lack of generalization from leg to arm suggests that neither the adaptation
of leg movements specifically, nor standing posture, nor the bilateral component of walking could be the salient feature allowing
for its broad generalization across body parts. |
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Keywords: | Motor learning Reaching Human Prisms Transfer |
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