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Shape Distortion Produced by Isolated Mismatch Between Vision and Proprioception

¹Department of Psychology, ²Department of Physiology and Pharmacology, and ³Canadian Institutes of Health Research Group on Action and Perception, University of Western Ontario, London; ⁴Department of Kinesiology and Health Science, York University, Toronto, Ontario, Canada; and ⁵Unité Mixte de Recherche 6149 Neurobiologie Intégrative et Adaptative, Centre National de la Recherche Scientifique, Marseille, France

Submitted 7 May 2007; accepted in final form 26 October 2007

To investigate the nature of the visuomotor transformation, previous studies have used pointing tasks and examined how adaptation to a spatially localized mismatch between vision and proprioception generalizes across the workspace. Whereas some studies found extensive spatial generalization of single-point remapping, consistent with the hypothesis of a global realignment of visual and proprioceptive spaces, other studies reported limited transfer associated with variations in initial limb posture. Here, we investigated the effects of spatially localized remapping in the context of a visuomanual tracking task. Subjects tracked a visual target tracing a simple two-dimensional geometrical form without visual feedback except at a single point, where the visual display of the hand was shifted relative to its actual position. After adaptation, hand paths exhibited distortions relative to the visual templates that were inconsistent with the idea of a global realignment of visual and proprioceptive spaces. Results of a visuoproprioceptive matching task showed that these distortions were not limited to active movements but also affected perception of passive limb movements.