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Visually induced cross-axis postsaccadic eye drift

Z Kapoula1, D A Robinson, L M Optican

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

Journal of Neurophysiology
|April 1, 1993
PubMed
Summary
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Researchers induced horizontal ocular drift after vertical saccades by moving a visual pattern post-saccade. This postsaccadic ocular drift persisted in the dark and was enhanced by the visual stimulus.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Perception

Background:

  • Previous research demonstrated inducing horizontal ocular drift after horizontal saccades using transient visual pattern movement.
  • Ocular drift is a postsaccadic phenomenon that can persist even in the absence of visual input.

Purpose of the Study:

  • To investigate if horizontal ocular drift can be induced following vertical saccades.
  • To quantify the characteristics and conditions of this induced drift.

Main Methods:

  • Five human subjects underwent training involving frequent vertical saccades while viewing a dynamic random-dot pattern.
  • A computer system detected saccade completion and immediately shifted the pattern horizontally.
  • Eye movements were recorded using electrooculography and eye-coil/magnetic-field methods before and after training.

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Main Results:

  • All subjects developed horizontal ocular drift after vertical saccades (left after up, right after down).
  • The drift amplitude was 2.7% in the dark and increased to 10.2% with the visual stimulus.
  • Disconjugate movements and changes in intrasaccadic vergence were observed, with some idiosyncratic variations.

Conclusions:

  • Horizontal ocular drift can be reliably induced after vertical saccades through a specific visual training paradigm.
  • The induced drift is influenced by the presence of the visual stimulus, suggesting a complex interplay between motor commands and visual feedback.
  • The findings highlight the plasticity of the oculomotor system in adapting to altered visual-motor relationships.