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Second-order motion perception in the peripheral visual field

J M Zanker1

  • 1Department of Psychology, University College London, UK.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|July 1, 1997
PubMed
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Second-order motion perception, crucial for seeing moving objects, is impaired in the visual periphery. This suggests the specialized two-layer model for processing motion-defined objects is limited to the central visual field.

Area of Science:

  • Visual neuroscience
  • Perception psychology

Background:

  • Motion perception distinguishes between first-order (luminance-defined) and second-order (complex attribute-defined) stimuli.
  • A two-layer model involving elementary motion detectors (EMDs) has been proposed for second-order motion processing.

Purpose of the Study:

  • To investigate whether the two-layer model for second-order motion perception operates across the entire visual field or is restricted to the fovea.
  • To examine the effects of visual eccentricity on the detection and discrimination of motion-defined stimuli.

Main Methods:

  • Tested detection, orientation, and motion direction discrimination of vertically moving bars at eccentricities from 0 to 16 degrees.
  • Stimuli included drift-balanced, Fourier, and theta motion defined on a dynamic noise background.

Related Experiment Videos

  • Controlled for changes in spatial scale in the peripheral visual system.

    • Main Results:

    • Direction discrimination for second-order motion (drift-balanced and theta) was severely impaired in the periphery.
    • Fourier motion direction discrimination and orientation/detection for all stimuli showed only marginal decline in the periphery.
    • Peripheral vision can detect motion-defined objects and their orientation, but not their direction of motion.

    Conclusions:

    • The findings support the hypothesis that the two-layer processing system for theta motion is confined to the central visual field.
    • Second-order motion perception, particularly direction discrimination, is significantly compromised in the visual periphery.