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Related Experiment Videos

Retinal image motion alone does not control disconjugate postsaccadic eye drift.

Z Kapoula1, L M Optican, D A Robinson

  • 1Laboratory of Sensorimotor Research, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892.

Journal of Neurophysiology
|May 1, 1990
PubMed
Summary
This summary is machine-generated.

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Postsaccadic ocular drift adapts to visual scene motion, even with dichoptic viewing, demonstrating conjugate adaptation that preserves abduction-adduction asymmetry. This adaptation reduces retinal image motion and persists in the dark.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vision Science

Background:

  • Postsaccadic ocular drift is a normal physiological eye movement following a saccade.
  • The visual system exhibits adaptive capabilities to stabilize retinal image motion.

Purpose of the Study:

  • To investigate the adaptive changes in postsaccadic ocular drift induced by visual scene motion.
  • To determine if these adaptations occur with monocular or dichoptic (two-eyed) viewing.
  • To examine the effect of adaptation on the normal asymmetry between abducting and adducting eyes.

Main Methods:

  • Human subjects underwent training where visual scene motion was coupled to saccades.
  • Eye movements were recorded using electrooculography and the eye coil-magnetic field method.

Related Experiment Videos

  • Adaptation was tested under monocular, dichoptic, and dark conditions.

    • Main Results:

    • Postsaccadic ocular drift adapted to reduce retinal image motion, with changes of 6.7% (monocular) and 6.0% (binocular).
    • Dichoptic viewing resulted in a smaller adaptation of 4.8%, but changes remained conjugate (obeying Hering's law).
    • The normal abduction-adduction asymmetry in postsaccadic drift was preserved after adaptation.

    Conclusions:

    • The human visual system can adapt postsaccadic ocular drift to stabilize vision.
    • Adaptation is conjugate and occurs even with dichoptic viewing, suggesting significant neural integration.
    • Adaptive changes preserve existing eye movement asymmetries, indicating a robust recalibration process.