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Receptive field dynamics underlying MST neuronal optic flow selectivity.

Chen Ping Yu1, William K Page, Roger Gaborski

  • 1Department of Computer Sciences, Rochester Institute of Technology Rochester, Rochester, New York, USA.

Journal of Neurophysiology
|May 12, 2010
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This summary is machine-generated.

Neurons in the medial superior temporal (MST) cortex process visual motion cues. Optic flow selectivity arises from dynamic interactions between local motion detectors, not just summation.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Visual Perception

Background:

  • Optic flow provides crucial information about an observer's heading direction.
  • Neurons in the medial superior temporal (MST) cortex are known to respond to optic flow and local motion stimuli.

Purpose of the Study:

  • To test the hypothesis that MST neurons' responses to optic flow are a simple sum of their responses to local motion patches.
  • To investigate the role of interactions between local motion response mechanisms in shaping optic flow selectivity.

Main Methods:

  • Recorded neuronal responses in monkey MST cortex to full-field optic flow and arrays of local motion patches.
  • Modeled local motion responses using Gaussian mixtures derived via a genetic algorithm.
  • Used gain-modulated models to account for interactions between receptive field segments during optic flow presentation.

Main Results:

  • Some MST neurons' optic flow responses corresponded well with summed local motion models, while others showed significant discrepancies.
  • Gain-modulated models provided uniformly better fits to optic flow responses, indicating altered neuronal properties due to segment co-activation.
  • Simultaneous presentation of local motion stimuli revealed direction- and location-specific interactions between response segments.

Conclusions:

  • MST's selectivity to optic flow is not merely a sum of local motion responses.
  • Dynamic interactions between spatially distributed local planar motion mechanisms underlie optic flow selectivity in MST.
  • Co-activation of receptive field segments significantly modulates neuronal response properties.