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Related Experiment Videos

Ocular kinematics and eye-hand coordination.

J D Crawford1, D Y P Henriques, W P Medendorp

  • 1York Centre for Vision Research, York University, Toronto, Canada. jdc@yorku.ca

Strabismus
|June 6, 2003
PubMed
Summary

The brain remaps visual information during eye movements to guide hand actions. This conversion-on-demand model explains how we interact with objects in space.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Visual Perception

Background:

  • Eye movements (saccades) complicate spatial interpretation from the retina.
  • Visual information needs updating across eye movements for effective hand guidance.
  • Transforming retinal data into motor commands for arm movement is complex.

Purpose of the Study:

  • To review mechanisms of visuomotor control during eye movements.
  • To explain how spatial representations are updated for action.
  • To present the 'conversion-on-demand' model of visuomotor transformation.

Main Methods:

  • Review of existing evidence on visuomotor representations.
  • Analysis of spatial updating across saccades.
  • Examination of geometric and head-orientation influences on visuomotor transformations.

Main Results:

  • Early visuomotor representations are remapped relative to gaze direction during saccades.
  • This remapping is consistent for targets in both near and far visual space.
  • The brain incorporates eye geometry and head orientation in visuomotor processing.

Conclusions:

  • The brain uses a 'conversion-on-demand' system for visuomotor transformations.
  • Only action-selected representations undergo complex transformations.
  • This provides an on-line map for interacting with objects in personal space.

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