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Updated: May 13, 2026
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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
The scintillating grid illusion is enhanced by binocular viewing.
Jenny C A Read1, Joseph H Robson, Christopher L Smith
1Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK;
I-Perception
|March 14, 2013
Summary
The scintillating grid illusion, a visual perception of black discs, is stronger with binocular viewing. However, weakening the illusion enhances monocular scintillation, revealing complex visual processing.
Area of Science:
- Visual perception
- Neuroscience
- Psychophysics
Background:
- The scintillating grid illusion involves illusory black discs perceived at white disc intersections on a grey grid.
- This illusion is typically stronger at non-fixated locations.
Purpose of the Study:
- To investigate the effect of binocular versus monocular viewing on the scintillating grid illusion.
- To explore the underlying mechanisms, including cyclopean contributions and disparity dependence.
Main Methods:
- Presenting the scintillating grid stimulus under binocular and monocular viewing conditions.
- Manipulating stimulus parameters, such as disc position relative to grid intersections, to assess changes in the illusion's strength.
Main Results:
- The scintillation percept is significantly stronger during binocular viewing compared to monocular viewing.
- This enhancement is not a simple linear summation of monocular inputs but involves a cyclopean contribution.
- When the illusion is weakened by displacing discs, monocular viewing leads to stronger scintillation.
Conclusions:
- Binocular viewing enhances the scintillating grid illusion through a specific cyclopean mechanism.
- The relationship between viewing condition and illusion strength is complex and depends on stimulus configuration.
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