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Phase-specific Surround suppression in Mouse Primary Visual Cortex Correlates with Figure Detection Behavior Based on

Fengling Li1, Weiqian Jiang1, Tian-Yi Wang1

  • 1Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai 200031, China; University of Chinese Academy of Sciences, Beijing 100049, China.

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Summary

Surround suppression in the primary visual cortex (V1) helps detect figures by distinguishing them from the background. This visual processing is crucial for figure-ground segregation and is influenced by stimulus contrast.

Keywords:
contextual modulationfigure-groundoptogeneticsrodentvisual behavior

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Neuronal responses in the primary visual cortex (V1) are modulated by surrounding stimuli.
  • Surround suppression, a key effect, is feature-dependent and linked to figure-ground segregation.

Purpose of the Study:

  • To investigate the link between feature-specific surround suppression in V1 and figure detection behavior.
  • To understand how figure-ground feature differences influence V1 neural activity and perception.

Main Methods:

  • Mice were trained on a figure detection task using gratings with varying spatial phases.
  • Electrophysiological recordings were performed in V1 of head-fixed mice.
  • Optogenetic inhibition of V1 inhibitory neurons (parvalbumin- and somatostatin-expressing) was used.

Main Results:

  • Figure detection performance improved with increasing figure-ground phase difference and was contrast-dependent.
  • Increased RF-surround phase difference reduced V1 surround suppression and enhanced neural discrimination.
  • V1 neural sensitivity to RF-surround phase difference was modulated by stimulus contrast.
  • Inhibiting V1 neurons impaired figure detection performance.

Conclusions:

  • Phase-specific surround suppression in V1 correlates with figure detection based on phase discontinuity.
  • V1 plays a critical role in processing figure-ground segregation through surround modulation.