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Proprioceptive and retinal afference modify postsaccadic ocular drift.

R F Lewis1, D S Zee, H P Goldstein

  • 1Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287, USA.

Journal of Neurophysiology
|August 13, 1999
PubMed
Summary
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Postsaccadic drift, which blurs vision, is suppressed by binocular viewing even without fusion. Proprioception from eye muscles influences drift, but not to correct errors, and visual adaptation doesn't need proprioceptive input.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vision Science

Background:

  • Saccades, rapid eye movements, are followed by postsaccadic drift, causing retinal slip and reduced visual acuity.
  • Understanding the sensory contributions to postsaccadic drift suppression is crucial for visual stability.

Purpose of the Study:

  • To investigate the roles of proprioceptive and retinal afference in suppressing postsaccadic drift after unilateral ocular muscle paresis.
  • To determine how different visual conditions affect postsaccadic drift and its adaptation.

Main Methods:

  • Recorded eye movements in three rhesus monkeys with induced unilateral vertical extraocular muscle paresis.
  • Examined postsaccadic drift under monocular and binocular viewing conditions, with and without disparity-reducing prisms, before and after proprioceptive deafferentation.

Related Experiment Videos

Main Results:

  • Unilateral muscle paresis induced vertical postsaccadic drift, suppressed during binocular viewing even without fusion.
  • Disparity-reducing prisms had variable effects on drift suppression, sometimes enhancing it.
  • Proprioceptive deafferentation altered postsaccadic drift idiosyncratically but did not impair visual adaptation.

Conclusions:

  • Disconjugate adaptation of postsaccadic drift can occur without binocular fusion.
  • Postsaccadic drift can be induced to reduce retinal disparity, even if it increases retinal slip.
  • Proprioception from extraocular muscles modifies postsaccadic drift, but not for error correction; visual adaptation is independent of proprioceptive input from the paretic eye.