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Related Experiment Videos

Monocular mechanisms determine plaid motion coherence

D Alais1, M J van der Smagt, F A Verstraten

  • 1Department of Psychology, Vanderbilt University, Nashville, TN 37240, USA.

Visual Neuroscience
|July 1, 1996
PubMed
Summary

The visual system

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Motion Processing

Background:

  • The neural basis of plaid motion coherence is not fully understood.
  • Area MT is a proposed candidate for plaid motion processing.
  • V1 cells respond to component gratings, while MT cells may respond to pattern direction.

Purpose of the Study:

  • To investigate the neural mechanisms underlying plaid motion coherence.
  • To determine the locus and characteristics of the plaid coherence mechanism.
  • To test feature-based versus component-based models of motion perception.

Main Methods:

  • Monocular and dichoptic adaptation paradigms using plaid and component gratings.
  • Psychophysical experiments measuring perceived plaid coherence and direction.
  • Spatial frequency tuning measurements of the coherence mechanism.

Main Results:

  • Monocular adaptation to a plaid-direction grating abolished perceived plaid coherence in an eye-specific manner.
  • Binocular (dichoptic) adaptation did not affect plaid coherence.
  • The coherence mechanism is broadly tuned and prefers lower spatial frequencies.
  • Data strongly support a feature-based model for perceived plaid direction.

Conclusions:

  • The plaid coherence mechanism is monocular and likely located at a lower visual processing level.
  • This mechanism responds to plaid features, not just component grating motion.
  • Perceived plaid direction is determined by feature motion, supporting a feature-based model.

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