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Related Experiment Videos

Sensorimotor representations for pointing to targets in three-dimensional space.

J F Soechting1, M Flanders

  • 1Department of Physiology, University of Minnesota, Minneapolis 55455.

Journal of Neurophysiology
|August 1, 1989
PubMed
Summary

Pointing accuracy in extrapersonal space is limited by sensorimotor transformation errors. Visual and kinesthetic information are accurate, but translating them into arm movements causes significant distance errors.

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Area of Science:

  • * Cognitive Psychology
  • * Neuroscience
  • * Human Motor Control

Background:

  • * Accurate pointing to targets in extrapersonal space is crucial for daily activities.
  • * Previous research suggests visual and kinesthetic feedback play roles in motor control.

Purpose of the Study:

  • * To investigate the accuracy of pointing to remembered target locations under various conditions.
  • * To identify the sources of error in pointing movements, particularly in distance and direction.

Main Methods:

  • * Subjects pointed to remembered target locations in both light and dark conditions.
  • * Error analysis focused on distance and direction, measured from the shoulder.
  • * Comparison of pointing accuracy with using a pointer and passive limb repositioning.

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Main Results:

  • * Significant errors in pointing distance (up to 15 cm) were observed, especially in the dark.
  • * Directional errors were smaller than distance errors.
  • * Errors persisted even with visual feedback, but were reduced when using a pointer or during passive repositioning.

Conclusions:

  • * Subjects possess accurate visual and kinesthetic representations of target locations.
  • * Pointing errors likely stem from inaccuracies in sensorimotor transformations.
  • * The translation from visual target information to motor commands for arm movement is a key source of error.