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Rapid horizontal gaze movement in the monkey

J O Phillips1, L Ling, A F Fuchs

  • 1Department of Physiology and Biophysics, University of Washington, Seattle 98195, USA.

Journal of Neurophysiology
|April 1, 1995
PubMed
Summary
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This study on monkey gaze shifts reveals that head and eye movements vary significantly. Head-free gaze shifts are more accurate but also more variable than head-fixed shifts.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Biomechanics

Background:

  • Gaze shifts involve coordinated eye and head movements.
  • Understanding these movements is crucial for studying visual-motor control.

Purpose of the Study:

  • To analyze the contributions of eye and head movements to gaze shifts in monkeys.
  • To compare gaze accuracy and metrics with the head fixed versus free.

Main Methods:

  • Monkeys performed horizontal gaze shifts toward jumping targets.
  • Eye and head positions and velocities were recorded with the head fixed and free.
  • Gaze shifts were analyzed at key temporal points.

Main Results:

  • Eye and head movement contributions varied across animals and movement sizes.

Related Experiment Videos

  • For small gaze shifts (<20°), only eye movements occurred.
  • Head movements increasingly contributed to larger gaze shifts, with head-free shifts being more accurate but variable.

    • Conclusions:

    • Gaze control differs when the head is free versus fixed.
    • Head movements show hypometric errors, particularly for target amplitudes <60°.
    • The findings provide insights into the neural control of gaze in primates.