Journal
EXPERIMENTAL BRAIN RESEARCH
Volume 202, Issue 3, Pages 543-552Publisher
SPRINGER
DOI: 10.1007/s00221-010-2155-0
Keywords
Interlimb transfer; Motor adaptation; Hand view; Visuomotor reaching; Motor control; Generalization; Human
Categories
Funding
- Canadian Institute of Health Research (CIHR)
- Institute of Musculoskeletal Health and Arthritis (IMHA)
- Banting Research Foundation
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Does the brain use a separate internal model for cursor mechanics during visuomotor adaptation? We compared the amount of adaptation and transfer to the opposite arm when subjects reached the targets under different viewing conditions of the arm during reaching. If the brain forms separate models, we predict a difference in the amount of adaptation and transfer for each viewing condition. If the brain forms one model, we predict equivalent amounts of adaptation and transfer between the two hands for each viewing condition. Separate groups of subjects performed a reaching task with either a rotated view of cursor motion representing their unseen hand or a rotated view of their actual hand. The two groups were further divided so that the magnitude of the rotation was either 45A degrees or 75A degrees counter-clockwise. After adapting to the rotation with one hand, subjects reached the same targets under the same viewing condition but with the opposite hand. Similar amounts of adaptation and intermanual transfer were found across the different magnitudes of rotation and across patterns of hand-order. Our results suggest that the brain may not be learning a distinct model for cursor mechanics, or if it is, it must be equivalent or overlapping with the arm model.
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