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Related Experiment Videos

Motion discrimination in cortically blind patients.

P Azzopardi1, A Cowey

  • 1Department of Experimental Psychology, University of Oxford, Oxford, UK. paul.azzopardi@psy.ox.ac.uk

Brain : a Journal of Neurology
|January 3, 2001
PubMed
Summary
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Patients with striate cortex damage can detect motion but struggle with direction discrimination for complex visual stimuli. This challenges theories of subcortical pathways for motion processing.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Neurobiology

Background:

  • Patients with striate cortex damage exhibit visual field defects but can sometimes discriminate stimuli using forced-choice methods.
  • Conflicting reports exist regarding the ability of these patients to discriminate motion direction within their scotomata.

Purpose of the Study:

  • To investigate motion detection and direction discrimination abilities in patients with cortical blindness.
  • To clarify discrepancies in previous research by examining responses to various motion stimuli.

Main Methods:

  • Three patients with cortical blindness performed forced-choice tasks involving first-order motion stimuli (bars, gratings, plaids, random dot kinematograms).
  • Stimuli depicted translation and motion in depth at speeds from 4 to 64 degrees/s.

Related Experiment Videos

  • Second-order stimuli were also tested to rule out light scatter effects.

    • Main Results:

    • Patients could detect movement across all stimulus types.
    • Direction discrimination was successful for single bars but failed for complex stimuli (gratings, plaids, random dot kinematograms).
    • Performance with random dot kinematograms was poor regardless of motion coherence or speed.

    Conclusions:

    • Motion processing within scotomata is significantly impaired following striate cortex damage.
    • The type of visual stimulus used is critical in explaining previous research discrepancies.
    • Impaired motion discrimination challenges the existence of a specialized subcortical pathway for 'fast' motion analysis bypassing the striate cortex.