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Looking for Details: Fine-Grained Visual Search at the Foveal Scale
Sanjana Kapisthalam1,2, Martina Poletti1,3,2
1Department of Brain and Cognitive Sciences, University of Rochester.
Biorxiv : the Preprint Server for Biology
|November 26, 2025
Summary
Visual search involves more than just finding objects; the brain actively scans even high-resolution central vision using tiny eye movements called microsaccades. This challenges traditional models by revealing detailed foveal exploration.
Area of Science:
- Neuroscience
- Cognitive Science
- Vision Science
Background:
- Traditional visual search models focus on extrafoveal object identification.
- These models assume no detailed search is needed within the high-resolution foveola.
- This overlooks potential fine-grained processing in central vision.
Purpose of the Study:
- To investigate visual search strategies within the foveated region.
- To determine if the visual system performs detailed analysis in central vision.
- To challenge existing paradigms of visual search.
Main Methods:
- Utilized state-of-the-art, high-precision eye tracking (arcminute accuracy).
- Localized the precise line of sight during visual tasks.
- Analyzed eye movement data, specifically microsaccades.
Main Results:
- Demonstrated effective visual search strategies within the foveola.
- Showcased the visuomotor system's precision in central vision.
- Identified microsaccades as key mediators of foveal exploration.
Conclusions:
- The traditional view of visual search is incomplete.
- The visual system actively implements detailed search strategies within the foveola.
- Microsaccades facilitate efficient examination of foveal input, creating dynamic priority maps.
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