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Transsaccadic visual perception of foveal compared to peripheral environmental changes
Sonia Bansal1,2,3, Wilsaan M Joiner4,5,6,7
1Department of Neuroscience, George Mason University, Fairfax, VA, USA.
Journal of Vision
|June 23, 2021
Summary
Extraretinal information, like corollary discharge (CD), aids visual stability. While beneficial for foveal perception, CD
Area of Science:
- Neuroscience
- Visual Perception
- Cognitive Science
Background:
- Stable visual perception during eye movements relies on extraretinal signals, such as corollary discharge (CD).
- Prior research primarily investigated CD's benefits for foveal vision, with limited understanding of its role in peripheral visual perception.
Purpose of the Study:
- To systematically compare the extent to which corollary discharge (CD) supports the perception of transsaccadic changes at the fovea versus the periphery.
- To quantify the accuracy and variability of perceived visual shifts with and without CD, in both central and peripheral vision.
Main Methods:
- Human subjects performed saccades to targets, with a reference point at the fovea or periphery.
- Perceived shifts of the reference point after a saccade were recorded and compared to simulated visual-only estimates.
- Perceptual thresholds for detection and location estimation were determined.
Main Results:
- At the fovea, perceptual estimates were 53% more accurate and 30% less variable compared to visual-only information.
- In the periphery, estimates were 34% more accurate and 9% less variable than visual-only information.
- These benefits were consistently lower for peripheral shifts than for foveal shifts.
Conclusions:
- Corollary discharge (CD) information contributes to stable visual perception in the visual periphery.
- The benefits of CD for visual stability are consistently greater at the fovea than in the periphery.
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