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Related Experiment Video

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Feature-based attention modulates surround suppression.

Anastasia V Flevaris1, Scott O Murray1

  • 1Department of Psychology, University of Washington, Seattle, WA, USA.

Journal of Vision
|January 30, 2015
PubMed
Summary
This summary is machine-generated.

Feature-based attention modulates visual surround suppression. Attending to matching features between a central target and its surround enhances suppression, demonstrating attention

Keywords:
feature-based attentionsurround suppressionvisual adaptation

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Surround suppression reduces neuronal firing and perceived contrast for stimuli within the classical receptive field (CRF).
  • Suppression is maximal when surround stimuli share orientation and spatial frequency (SF) with the central target.
  • The influence of feature-based attention on surround suppression remains largely uncharacterized.

Purpose of the Study:

  • To investigate how feature-based attention affects center-surround interactions in visual processing.
  • To determine if attending to specific feature dimensions (orientation or SF) differentially modulates surround suppression.
  • To examine the interplay between spatial frequency and orientation in feature-based attention and surround suppression.

Main Methods:

  • Utilized behavioral contrast adaptation in human participants.
  • Employed center-surround Gabor triplets (central target, two flanking Gabors) for adaptation.
  • Measured contrast thresholds for the central target before and after adaptation to assess surround suppression.

Main Results:

  • Both orientation and spatial frequency independently contribute to surround suppression, without summation.
  • When center and surround features matched in one dimension but differed in another, attention modulated suppression.
  • Attention directed to the matching feature dimension resulted in greater surround suppression compared to attention to the differing dimension.

Conclusions:

  • Feature-based attention significantly influences center-surround interactions in visual perception.
  • Attentional modulation enhances surround suppression effects, particularly when attended features align between the center and surround.
  • These findings highlight the role of attention in shaping how visual information is processed within different spatial contexts.