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Related Experiment Video

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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Unmasking saccadic uncrowding.

Mehmet N Ağaoğlu1, Haluk Öğmen2, Susana T L Chung1

  • 1School of Optometry, University of California, Berkeley, Berkeley, CA 94720-2020, United States.

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|September 4, 2016
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Pre-saccadic visual perception benefits from unmasking but not uncrowding. Saccades primarily improve letter recognition through masking effects, not by reducing crowding.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Briefly presented stimuli near saccades can cause distortions.
  • These distortions don't always impair stimulus visibility.
  • Saccade targeting can release stimuli from masking and crowding.

Purpose of the Study:

  • Investigate pre-saccadic changes in letter recognition.
  • Compare saccadic uncrowding and unmasking mechanisms.
  • Determine if saccadic effects on masking and crowding are similar.

Main Methods:

  • Assessed single and crowded letter recognition before saccades.
  • Conducted experiments with and without backward masks.
  • Utilized a dual-channel neural model with saccadic add-ons.

Main Results:

  • Pre-saccadic improvements were mainly linked to masks/transients.
  • No significant decrease in crowding strength was observed pre-saccade.
  • Saccades significantly reduced backward masking effects.

Conclusions:

  • Results contradict the concept of saccadic uncrowding.
  • Findings strongly support the existence of saccadic unmasking.
  • Pre-saccadic letter recognition involves multiple perisaccadic mechanisms.