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The Attentional Suppressive Surround: Eccentricity, Location-Based and Feature-Based Effects and Interactions.

Sang-Ah Yoo1,2, John K Tsotsos2,3, Mazyar Fallah1,2,4

  • 1Department of Psychology, York University, Toronto, ON, Canada.

Frontiers in Neuroscience
|October 24, 2018
PubMed
Summary

Visual attention uses a suppressive surround to inhibit irrelevant stimuli. This study shows surround suppression is strongest for similar features in proximity and expands with visual eccentricity, supporting the Selective Tuning model.

Keywords:
attentionfeature-based attentionlocation-based attentionselective tuningsurround suppressionvisionvisual processing

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • The Selective Tuning model posits a suppressive surround around the focus of visual attention.
  • This attentional suppressive surround inhibits irrelevant information in both physical and feature spaces.

Purpose of the Study:

  • To investigate the interaction between location-based and feature-based surround suppression.
  • To test if attentional surround suppression is modulated by stimulus size and eccentricity.

Main Methods:

  • Experiment 1 examined perceptual discrimination for stimuli with similar orientations presented in proximity.
  • Experiment 2 manipulated stimulus size and eccentricity to measure changes in the attentional suppressive surround.

Main Results:

  • Perceptual discrimination was impaired when similar orientations were spatially close, indicating interaction between suppression mechanisms.
  • The size of the attentional suppressive surround increased with stimulus eccentricity, but not stimulus size.
  • These findings held for both low-level (orientation) and high-level (faces) features.

Conclusions:

  • The study provides evidence for the existence of the attentional suppressive surround.
  • New properties of this visual selection mechanism, including its modulation by feature similarity and eccentricity, were revealed.