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Volume 16, Number 21, Issue of November 1, 1996 pp. 7085-7096
Copyright ©1996 Society for Neuroscience

Generalization to Local Remappings of the Visuomotor Coordinate Transformation

Received March 12, 1996; revised Aug. 13, 1996; accepted Aug. 19, 1996.

Zoubin Ghahramani¹, Daniel M. Wolpert², and Michael I. Jordan¹

¹ Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, and ² Sobell Department of Neurophysiology, Institute of Neurology, London WC1N 3BG, United Kingdom

During visually guided movement, visual representations of target location must be transformed into coordinates appropriate for movement. To investigate the representation and plasticity of the visuomotor coordinate transformation, we examined the changes in pointing behavior after local visuomotor remappings. The visual feedback of finger position was limited to one or two locations in the workspace, at which a discrepancy was introduced between the actual and visually perceived finger position. These remappings induced changes in pointing, which were largest near the locus of remapping and decreased away from it. This pattern of spatial generalization highly constrains models of the computation of the visuomotor transformation in the CNS. A simple model, in which the transformation is computed via the population activity of a set of units with large sensory receptive fields, is shown to capture the observed pattern.

Key words: human psychophysics; visuomotor learning; coordinate transformations; prism adaptation; computational model; sensorimotor remapping; motor learning

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