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1 CNRS, UMR 6149 Neurobiologie Integrative et Adaptive, United States; Psychology, University of Western Ontario, Social Sciences Bg, London, N6A 5C2, Canada
2 Kinesiology and Health Science, York University, Toronto, Canada
3 Psychology, University of Western Ontario, London, Canada
* To whom correspondence should be addressed. E-mail: nmalfait{at}gmail.com.
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 visuo-manual tracking task. Subjects tracked a visual target tracing a simple 2D geometrical form without visual feedback except at a single point, where the visual display of the hand was shifted relative to its actual position. Following 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. The results of a visuo-proprioceptive matching task showed that these distortions were not limited to active movements but also affected perception of passive limb movements.
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T. Wong and D. Y. P. Henriques Visuomotor Adaptation Does Not Recalibrate Kinesthetic Sense of Felt Hand Path J Neurophysiol, February 1, 2009; 101(2): 614 - 623. [Abstract] [Full Text] [PDF] |
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