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Related Experiment Videos

Glass pattern responses in macaque V2 neurons.

Matthew A Smith1, Adam Kohn, J Anthony Movshon

  • 1Center for Neural Science, New York University, New York, NY, USA. mattsmith@cmu.edu

Journal of Vision
|April 28, 2007
PubMed
Summary
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Area V2 neurons in macaque visual cortex respond similarly to local cues in Glass patterns as V1 neurons. Global form in the surround does not influence V2 responses, suggesting complex pattern coding occurs later in the visual system.

Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Computational Neuroscience

Background:

  • Area V2 is implicated in complex pattern coding beyond simple stimuli.
  • The role of the extra-classical surround in V2 function is under-explored.
  • Previous work established V1 responses to Glass patterns based on grating stimuli.

Purpose of the Study:

  • To investigate V2 neuronal sensitivity to global form cues in Glass patterns.
  • To extend previous V1 Glass pattern response models to V2.
  • To determine the influence of the extra-classical surround on V2 responses to Glass patterns.

Main Methods:

  • Electrophysiological recordings from V2 neurons in macaques.
  • Presentation of translational Glass patterns with varying global form cues.

Related Experiment Videos

  • Analysis of V2 responses within the classical receptive field (CRF) and in relation to the surround.
  • Comparison of V2 responses with established V1 responses.

    • Main Results:

    • V2 neurons exhibit sensitivity to local signals within Glass patterns, akin to V1.
    • Responses of V2 neurons to Glass patterns were not modulated by global form cues in the surround.
    • No significant influence of global form in the surround on V2 cell responses was observed.

    Conclusions:

    • V2 neurons process local features in Glass patterns similarly to V1.
    • Global form processing in Glass patterns likely occurs at later stages of the visual pathway.
    • The extra-classical surround does not appear to play a critical role in V2's initial Glass pattern analysis.