Related Experiment Video
Updated: Aug 16, 2025
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Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
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Eye movements during optic flow perception
Hiu Mei Chow1, Miriam Spering2
1Dept. of Psychology, St. Thomas University, Fredericton, Canada; Dept. of Ophthalmology and Visual Sciences, University of British Columbia, Vancouver, Canada.
Vision Research
|December 25, 2022
Summary
Eye movements enhance optic flow perception. Specifically, foveating eye movements improved detection of visual changes in optic flow, but not coarse localization tasks.
Area of Science:
- Visual perception
- Neuroscience
- Human locomotion
Background:
- Optic flow is a crucial visual cue for navigation and perception.
- Eye movements are naturally triggered by optic flow.
Purpose of the Study:
- To investigate if eye movements limit or enhance optic flow direction perception.
- To determine the impact of different eye movement strategies on optic flow tasks.
Main Methods:
- Two experiments were conducted with human observers performing optic flow tasks (localization and change detection).
- Eye movements were recorded during both free viewing and fixation conditions.
- Task difficulty was manipulated by varying motion coherence.
Main Results:
- Eye movements, including saccades and smooth pursuit, were directed towards the focus of expansion (FOE) in both viewing conditions.
- Optic flow localization sensitivity was unaffected by eye movement instructions.
- Change detection sensitivity at the FOE was significantly higher (27%) during free viewing compared to fixation.
Conclusions:
- Foveating eye movements, particularly saccades, provide a performance benefit for fine-grain perceptual tasks involving optic flow.
- The benefit of eye movements is task-dependent, enhancing change detection but not coarse localization.
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