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Foveal target repetitions reduce crowding
Bilge Sayim1, John A Greenwood2, Patrick Cavanagh3
1Laboratory of Experimental Psychology, University of Leuven, Leuven, Belgium Université Paris Descartes, Sorbonne Paris Cité, Paris, France CNRS UMR 8158, Paris, France.
Journal of Vision
|October 9, 2014
Summary
Peripheral vision crowding is not always irreversible. Remote items matching a crowded target can enhance target recognition, suggesting long-range grouping mechanisms aid visual perception.
Area of Science:
- Visual Perception
- Cognitive Neuroscience
Background:
- Crowding limits peripheral vision, making object identification difficult when flanked by similar items.
- It is commonly assumed that crowded target signals are lost due to signal combination with flankers.
Purpose of the Study:
- To investigate if signals from remote items, outside the crowding region, can enhance or retrieve a crowded target signal.
- To determine if matching remote items improve discrimination of a peripheral, crowded target compared to nonmatching remote items.
Main Methods:
- Experiment 1: Varied remote item location to assess its impact on target discrimination.
- Experiment 2: Manipulated stimulus onset asynchrony between target and remote items.
- Experiment 3: Tested if semantic knowledge alone could improve target discrimination.
Main Results:
- A matching remote item presented in the fovea improved target discrimination.
- The enhancement effect was strongest when the remote item was presented simultaneously with the target.
- Semantic knowledge of the target did not improve discrimination.
Conclusions:
- Crowded target signals are not irretrievably lost and can be facilitated by remote matching items.
- This
- uncrowding
- effect is likely mediated by long-range grouping mechanisms.
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