Generalization to Local Remappings of the Visuomotor Coordinate Transformation

To investigate the representation and plasticity of the visuomotor coordinate transformation we examined the changes in pointing behavior subsequent to local 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 proprioceptively- and visually-perceived finger position. Such a local remapping 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 how the central nervous system computes the visuomotor transformation. However, 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. Ghahramani et al. Visuomotor Generalization 3 Generalization to local remappings of the visuomotor coordinate transformation In order to reach or point to a visually perceiv..