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Updated: May 23, 2026
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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
Published on: March 18, 2019
Dimension-specific signal modulation in visual search: evidence from inter-stimulus surround suppression.
Louis K H Chan1, William G Hayward
1Psychology Unit, Hong Kong Baptist University, Hong Kong. clouis@graduate.hku.hk
Journal of Vision
|April 20, 2012
Summary
Visual search relies on saliency, where items suppress each other. This study found that closer distractors reduce interference, but only when they share perceptual dimensions, indicating dimension-specific surround suppression.
Area of Science:
- Cognitive Science
- Neuroscience
- Psychology
Background:
- Visual attention guides where we look next, often driven by visual saliency.
- Computational models propose iterative saliency estimation with mutual suppression between visual items, especially when proximate.
Purpose of the Study:
- To investigate the proposed surround suppression mechanism in visual saliency estimation.
- To test how the distance between two salient distractors affects visual search performance for a target.
Main Methods:
- The study employed a visual search task with a size target and two salient distractors.
- The distance between the two distractors was manipulated while keeping the target-to-distractor distance constant.
Main Results:
- Search interference decreased when distractors were closer together, supporting the surround suppression hypothesis.
- This distance effect was observed only for distractors sharing the same perceptual dimension (e.g., color).
- No significant distance effect was found for distractors defined by different dimensions (e.g., color and shape).
Conclusions:
- Visual saliency is computed via a surround suppression process.
- This surround suppression mechanism operates at a dimension-specific level, showing specificity to perceptual features.
