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Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities
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Responses to second-order texture modulations undergo surround suppression.

Helena X Wang1, David J Heeger, Michael S Landy

  • 1Center for Neural Science, New York University, New York, NY 10003, United States. helena.wang@nyu.edu

Vision Research
|July 20, 2012
PubMed
Summary
This summary is machine-generated.

Second-order visual stimuli exhibit surround suppression, similar to first-order stimuli. This indicates that visual normalization processes occur at multiple stages in the brain.

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Area of Science:

  • Visual neuroscience
  • Perceptual psychology
  • Computational neuroscience

Background:

  • First-order (contrast) surround suppression is well-understood psychophysically and physiologically.
  • Limited knowledge exists regarding second-order visual stimuli and center-surround interactions.
  • Second-order stimuli rely on features like contrast or orientation modulation.

Purpose of the Study:

  • To investigate whether second-order visual stimuli undergo surround suppression.
  • To characterize the nature of second-order surround suppression for contrast-modulated (CM) and orientation-modulated (OM) stimuli.
  • To determine if second-order suppression is orientation-specific.

Main Methods:

  • Subjects detected second-order modulation in stimuli presented alone or with a surround.
  • Contrast-modulated (CM) and orientation-modulated (OM) stimuli were employed.
  • Detection thresholds were measured to quantify suppression.

Main Results:

  • Second-order surrounds generally increased detection thresholds, indicating suppression for both CM and OM stimuli.
  • Suppression for CM stimuli was orientation-specific (stronger for parallel surrounds).
  • Evidence for orientation specificity was weaker for OM stimuli.

Conclusions:

  • Second-order visual stimuli exhibit surround suppression, analogous to first-order stimuli.
  • Normalization, leading to surround suppression, likely operates at multiple cortical processing stages.
  • The findings contribute to understanding the neural basis of visual perception and feature integration.