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Binocular summation is affected by crowding and tagging
Ziv Siman-Tov1, Maria Lev1, Uri Polat2
1School of Optometry and Vision Sciences, Bar-Ilan University, Ramat Gan, Israel.
Scientific Reports
|March 2, 2021
Summary
Color tagging reduces visual crowding in the fovea for people with normal vision. This technique also helps recover binocular summation, which is usually impaired by crowding.
Area of Science:
- Visual perception
- Neuroscience
- Psychophysics
Background:
- Perceptual crowding limits visual processing, typically considered absent in the fovea but present in amblyopia under specific conditions.
- Dissimilar targets and flankers (tagging) can reduce crowding.
- Binocular vision increases processing load, potentially interacting with crowding.
Purpose of the Study:
- Investigate if color tagging reduces foveal crowding in normal vision.
- Determine how crowding interacts with binocular vision.
Main Methods:
- Used color tagging to differentiate target letters from flankers in the fovea.
- Measured crowding effects and binocular summation under different conditions.
Main Results:
- Color tagging significantly reduced foveal crowding in subjects with normal vision.
- Binocular summation, expected around 40%, was reduced under crowding but recovered with color tagging.
- Crowding imposes a high processing load, interfering with binocular summation.
Conclusions:
- Color tagging enhances target segmentation, reducing the crowding effect in the fovea.
- Reduced crowding via color tagging allows for the recovery of binocular summation.
- Visual crowding significantly impacts higher-level visual processing, including binocular integration.
