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Related Experiment Videos

Responses in extrastriate cortex to optic flow during simulated turns.

Helen Sherk1, Jong-Nam Kim

  • 1Department of Biological Structure, University of Washington, Seattle 98195, USA. has@u.washington.edu

Visual Neuroscience
|January 4, 2003
PubMed
Summary

Researchers discovered specialized visual neurons in cats that detect turning motions during locomotion. These "turn-selective" cells in the lateral suprasylvian visual area show distinct responses to specific turning directions, aiding navigation.

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Animal Behavior

Background:

  • Optic flow patterns change significantly during self-motion, particularly during turns.
  • The visual system must interpret these complex optic flow changes for navigation.
  • The extrastriate visual cortex plays a role in processing visual information beyond primary areas.

Purpose of the Study:

  • To investigate neuronal responses in the cat's extrastriate area LS to optic flow simulating locomotion and turns.
  • To identify and characterize visual neurons selective for turning movements.
  • To explore the factors contributing to the selectivity of these neurons for specific turns.

Main Methods:

  • Recorded responses of 326 neurons in the lateral suprasylvian visual area (LS) of cats.

Related Experiment Videos

  • Presented visual stimuli simulating optic flow during straight-line locomotion and various left/right turns.
  • Compared neuronal responses to preferred turning stimuli, opposite turns, and straight-ahead optic flow.

    • Main Results:

    • Approximately 60% of LS cells responded to optic flow simulating turns.
    • A subset of 15% of cells exhibited 'turn-selective' responses, preferring turns in one direction.
    • Turn-selective cells responded better to preferred turning movies than to fronto-parallel motion stimuli.

    Conclusions:

    • The extrastriate area LS contains neurons specialized for detecting turning optic flow during locomotion.
    • These 'turn-selective' cells contribute to the visual processing of self-motion and navigation.
    • While direction selectivity plays a role, other stimulus features also influence turn preference in these neurons.