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Task-Specific Sensorimotor Adaptation to Reversing Prisms

¹York Centre for Vision Research and Canadian Institutes of Health Research Group for Action and Perception, and ²Departments of Psychology, Biology, and Kinesiology and Health Sciences, York University, Toronto, Ontario, Canada; and ³Department of Psychology, University of Manitoba, Winnipeg, Manitoba, Canada

Submitted 20 August 2004; accepted in final form 21 September 2004

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-specific and 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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