Online Visual Control of the Arm

  1. Gregory R. Bock organizer and
  2. Jamie A. Goode
  1. Apostolos P. Georgopoulos1,2

Published Online: 28 SEP 2007

DOI: 10.1002/9780470515563.ch9

Novartis Foundation Symposium 218 - Sensory Guidance of Movement

Novartis Foundation Symposium 218 - Sensory Guidance of Movement

How to Cite

Georgopoulos, A. P. (2007) Online Visual Control of the Arm, in Novartis Foundation Symposium 218 - Sensory Guidance of Movement (eds G. R. Bock and J. A. Goode), John Wiley & Sons, Ltd., Chichester, UK. doi: 10.1002/9780470515563.ch9

Author Information

  1. 1

    Brain Sciences Center (11B), Veterans Affairs Medical Center, Minneapolis, MN 55417, USA

  2. 2

    Departments of Physiology, Neurology and Psychiatry, University of Minnesota Medical School, Minneapolis, MN 55455, USA

Publication History

  1. Published Online: 28 SEP 2007

ISBN Information

Print ISBN: 9780471982623

Online ISBN: 9780470515563

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Keywords:

  • online visual control;
  • pointing movements;
  • visual information;
  • probability of occurrence;
  • peak velocity

Summary

The psychophysical and cerebrocortical mechanisms in visually guided reaching movements and isometric force pulses are discussed. The results of psychophysical studies of pointing movements have demonstrated a tight coupling between the visual information and the direction of the movement, and those of studies of directed isometric force pulses have documented the sensitive dependence of the motor system on the continuous availability of visual information for the ongoing correction of directional deviations from the instructed direction. Recordings of the activity of single cells in the motor cortex and parietal areas 2 and 5 have revealed the same tight, online coupling between visual information and cell discharge, and have partially elucidated the neural mechanisms underlying this function at the cortical level.