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Related Experiment Videos

Inputs to directionally selective simple cells in macaque striate cortex

R L De Valois1, N P Cottaris

  • 1Psychology Department, University of California, Berkeley, CA 94720, USA. russ@valois.berkeley.edu

Proceedings of the National Academy of Sciences of the United States of America
|November 25, 1998
PubMed
Summary

Researchers identified two distinct cell types in the visual cortex that likely form the basis of motion detection. This discovery sheds light on how the brain processes directional visual motion.

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Computational Neuroscience

Background:

  • The striate cortex is crucial for initial visual motion analysis.
  • Directionally selective cells respond to motion in one direction only.
  • Existing motion models require inputs with specific spatio-temporal receptive field (RF) properties.

Purpose of the Study:

  • To investigate the space-time RF structure of cells in the macaque striate cortex.
  • To determine if cells exist that fulfill the temporal quadrature requirements for motion models.
  • To understand how directionally selective cells are formed from simpler inputs.

Main Methods:

  • Examined space-time RF structure of simple cells in macaque striate cortex.
  • Identified two subpopulations of nondirectional simple cells based on temporal response biphasicity.

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  • Utilized principal component analysis (PCA) on RFs of directionally selective cells.

    • Main Results:

    • Discovered two distinct subpopulations of nondirectional simple cells with temporal impulse responses approximately 90 degrees apart.
    • Found that strongly biphasic cells have shorter latency than weakly biphasic cells.
    • PCA indicated that directionally selective cell RFs can be modeled as a linear combination of these two nondirectional cell types.

    Conclusions:

    • The visual motion system may achieve temporal quadrature by integrating inputs from strongly and weakly biphasic nondirectional cells.
    • These nondirectional cells may receive input from magnocellular and parvocellular layers of the lateral geniculate nucleus.
    • This provides a potential neural mechanism for the emergence of directional selectivity in the striate cortex.