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J Neurophysiol (September 22, 2004). doi:10.1152/jn.00859.2004
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Submitted on August 20, 2004
Accepted on September 21, 2004

TASK-SPECIFIC SENSORIMOTOR ADAPTATION TO REVERSING PRISMS

Jonathan J. Marotta1*, Gerald P. Keith1, and J. D. Crawford1

1 Centre for Vision Research and Canadian Institutes of Health Research Group for Action and Perception, York University, Toronto, Ontario, Canada

* To whom correspondence should be addressed. E-mail: marotta{at}cc.umanitoba.ca.

We tested between three levels of visuospatial adaptation (global map, parallel feature modules, and parallel sensorimotor transformations) by training subjects to reach and grasp virtual objects viewed through a left-right reversing prism, with either visual location or orientation feedback. Even though spatial information about the global left-right reversal was present in every training session, subjects trained with location feedback reached to the correct location but with the wrong (reversed) grasp orientation. Subjects trained with orientation feedback showed the opposite pattern. These errors were task- (not feature-) specific; subjects trained to correctly grasp visually-reversed oriented bars failed to show knowledge of the reversal when asked to point to the end locations of these bars. These results show that adaptation to visuospatial distortion - even global reversals - is implemented through learning rules that operate on parallel sensorimotor transformations (e.g., reach vs. grasp).




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