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Input-gain control produces feature-specific surround suppression.

Alexander R Trott1, Richard T Born2

  • 1Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, and atrott@fas.harvard.edu Richard_born@hms.harvard.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 27, 2015
PubMed
Summary
This summary is machine-generated.

Surround stimuli in the visual cortex (V1) suppress neuronal responses, particularly when matching center stimuli. This suppression selectively targets matched features, indicating a feature-specific gain control mechanism.

Keywords:
efficient codinginput gainsurround suppression

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Neuronal responses in the primary visual cortex (V1) are influenced by contextual stimuli.
  • Surround stimuli often suppress responses to center stimuli, especially when they match.

Purpose of the Study:

  • To investigate the underlying mechanism of surround suppression in V1.
  • To determine how center-surround interactions shape neuronal responses.

Main Methods:

  • Recorded neuronal activity in V1 of alert monkeys using multielectrode arrays.
  • Presented various center-surround stimulus combinations, including gratings and plaid patterns.
  • Analyzed population responses and orientation tuning curves.

Main Results:

  • Surround stimuli scaled population responses when center and surround gratings matched.
  • When the center contained a plaid with one matching component, suppression selectively affected the matched component.
  • This resulted in a shift of the population orientation tuning curve, favoring the unmatched component.

Conclusions:

  • Surround suppression in V1 is mediated by a feature-specific input-gain control mechanism.
  • This mechanism selectively reduces the effective strength of stimulus attributes that match the surround.
  • Findings support theoretical models of context-dependent neuronal processing.