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Colored aftereffects contingent upon global transformations?

J Broerse1, C Shaw, P Dodwell

  • 1Department of Psychology, University of Queensland, St Lucia, Australia.

Spatial Vision
|January 1, 1994
PubMed
Summary
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Colored aftereffects (CAEs) are linked to global pattern geometries. This study shows motion-based CAEs interact locally, unlike stationary pattern-based CAEs which rely on global geometry.

Area of Science:

  • Visual Perception
  • Computational Neuroscience
  • Psychophysics

Background:

  • Colored aftereffects (CAEs) are theorized to depend on global geometric properties of visual stimuli.
  • Previous models applied Lie group mathematics to perceptual invariance, linking specific CAEs to rotation, dilation, and translation invariances.

Purpose of the Study:

  • To investigate if CAEs contingent on radial and rotational stimulus dynamics exhibit properties comparable to those linked to translation.
  • To determine whether the underlying motion components for these CAEs are locally or globally determined.

Main Methods:

  • Induction of complementary CAEs using radially expanding/contracting bullseyes and rotating spokes.
  • Testing linear combination of these CAEs with spiral motion stimuli.

Related Experiment Videos

  • Examining interactions between CAEs from motion stimuli (bullseyes, gratings) and stationary stimuli.

    • Main Results:

    • Confirms simultaneous induction of complementary CAEs with radial and rotational patterns.
    • Demonstrates linear combination of these CAEs with spiral motion.
    • Reveals interactions between motion-based CAEs (radial) and translation-based CAEs (gratings), contrasting with stationary patterns.

    Conclusions:

    • CAEs induced by radial and rotational motion stimuli combine linearly and generalize to spiral motion.
    • Unlike CAEs from stationary patterns, motion-based CAEs show local determination, indicated by interactions between radial and translational motion components.