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Related Experiment Videos

Surround suppression in primate V1.

H E Jones1, K L Grieve, W Wang

  • 1Department of Visual Science, Institute of Ophthalmology, University College London, London EC1V 9EL, United Kingdom. h.jones@ucl.ac.uk

Journal of Neurophysiology
|October 16, 2001
PubMed
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Researchers explored surround suppression in the primate visual cortex (V1). They found distinct mechanisms, including center-gated surround suppression (CGSS), influencing neuronal responses and potentially aiding motion contrast perception.

Area of Science:

  • Neuroscience
  • Visual Neuroscience
  • Computational Neuroscience

Background:

  • Surround suppression is a key visual processing phenomenon.
  • Its spatial organization and underlying mechanisms in primate V1 remain incompletely understood.
  • Understanding V1 circuitry is crucial for deciphering visual perception.

Purpose of the Study:

  • To investigate the spatial organization and mechanisms of surround suppression in primate V1.
  • To determine the direction dependence and laminar distribution of these suppressive effects.
  • To explore the potential role of surround suppression in processing motion contrast.

Main Methods:

  • Utilized drifting stimuli presented within and around the classical receptive field (CRF) of V1 neurons.
  • Configured stimuli to examine uniform surrounds, annuli, and direction contrast.

Related Experiment Videos

  • Analyzed neuronal responses across different cortical layers and stimulus configurations.

    • Main Results:

    • Vast majority (94%) of V1 cells exhibited surround suppression to stimuli exceeding the CRF.
    • Two main patterns identified: classical surround suppression (CSS) and center-gated surround suppression (CGSS).
    • Direction contrast and reverse motion interfaces modulated suppression, with some cells showing facilitation.

    Conclusions:

    • Both CSS and CGSS mechanisms are present in V1, with varying strengths.
    • Surround modulation, especially with reverse motion, suggests a role in extracting motion contrast.
    • Findings imply V1's involvement in representing 3D structure from motion cues.