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Related Experiment Videos

Saccadic suppression and stimulus uncertainty.

D S Greenhouse1, T E Cohn

  • 1School of Optometry, University of California, Berkeley 94720.

Journal of the Optical Society of America. A, Optics and Image Science
|March 1, 1991
PubMed
Summary
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Saccadic suppression, a drop in visual detection during eye movements, may stem from increased stimulus uncertainty. This study confirms that uncertainty during saccades fully explains reduced flash detectability.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Saccadic suppression describes the reduced visibility of stimuli during rapid eye movements (saccades).
  • Previous hypotheses suggest this suppression might be linked to increased sensory or cognitive uncertainty during saccades.
  • Matin's hypothesis posits that visual frame of reference instability during saccades increases stimulus uncertainty.

Purpose of the Study:

  • To test Matin's hypothesis that saccadic suppression results from increased stimulus uncertainty during saccades.
  • To quantify the degree of uncertainty during saccades and assess its contribution to suppression.
  • To investigate the effect of reducing uncertainty on saccadic suppression.

Main Methods:

  • Measured flash detectability during saccades versus fixation using a light-adapted detection task.

Related Experiment Videos

  • Utilized receiver-operating-characteristic (ROC) analysis to assess changes in uncertainty.
  • Manipulated uncertainty by using flashed pedestals and spatially separate markers.

    • Main Results:

    • An average 0.6-log-unit reduction in flash detectability was observed during saccades.
    • ROC slopes were significantly reduced during saccades, indicating increased uncertainty.
    • Reducing uncertainty with a flashed pedestal eliminated saccadic suppression and ROC slope changes.
    • Spatially separate markers partially reduced saccadic suppression in one subject.

    Conclusions:

    • Findings support the hypothesis that increased uncertainty during saccades fully accounts for saccadic suppression.
    • Saccades lead to uncertainty regarding subjective visual direction, impacting stimulus detection.
    • The magnitude of uncertainty change during saccades directly correlates with the observed suppression effect.