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Related Experiment Videos

Tonic interocular suppression, binocular summation, and the visual evoked potential

T Eysteinsson1, M C Barris, N Denny

  • 1Department of Ophthalmology, University of Iceland, Reykjavik.

Investigative Ophthalmology & Visual Science
|July 1, 1993
PubMed
Summary

Dark-adapted eyes exert tonic interocular suppression (TIS) on spatial vision. This study demonstrates TIS using visual evoked potential (VEP) procedures, confirming its presence and impact on visual processing.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Perception

Background:

  • Psychophysical studies indicate that a dark-adapted eye exerts tonic interocular suppression (TIS) on spatial vision in the contralateral eye.
  • This phenomenon suggests an inhibitory influence of one eye's visual input on the other.

Purpose of the Study:

  • To demonstrate the existence of tonic interocular suppression (TIS) using visual evoked potential (VEP) procedures.
  • To correlate VEP findings with established psychophysical evidence of TIS.

Main Methods:

  • Evoked cortical potentials were recorded in response to reversing checkerboard patterns (3-12 cycles/degree).
  • VEPs were measured under monocular viewing with a dark-adapted contralateral eye, manipulated adaptation states, and binocular viewing.
  • Data were collected from three healthy young adult males.

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Main Results:

  • Monocular VEP amplitude was significantly smaller when the contralateral eye was dark-adapted compared to a dim, homogeneous field.
  • The amplitude of monocular evoked responses during dark adaptation mirrored the time course of psychophysically measured rod thresholds.
  • Monocular evoked responses in the presence of an interocular adapting field resembled binocular responses.

Conclusions:

  • Tonic interocular suppression (TIS) can be readily demonstrated using visual evoked potential (VEP) methods, complementing psychophysical findings.
  • The enhanced VEP amplitude during binocular viewing may result from the reduction of TIS, rather than solely from physiological binocular summation.