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Stereomotion speed perception is contrast dependent.

K Brooks1

  • 1Department of Experimental Psychology, University of Sussex, Brighton BN1 9QG, UK. kbrooks@mail.arc.nasa.gov

Perception
|July 24, 2001
PubMed
Summary
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Lowering contrast reduces perceived speed for both 3D stereomotion and 2D lateral motion. This suggests the 2D motion system significantly influences 3D motion perception, especially for approaching stimuli.

Area of Science:

  • Visual perception
  • Motion perception
  • Psychophysics

Background:

  • The 'Thompson effect' describes how reduced contrast lowers perceived speed.
  • Investigating this effect in both 3D stereomotion and 2D lateral motion is crucial for understanding visual processing.
  • Understanding the interplay between monocular and binocular motion systems is key.

Purpose of the Study:

  • To investigate the influence of contrast on perceived stimulus speed.
  • To compare the 'Thompson effect' in stereomotion versus monocular lateral motion.
  • To explore the relationship between monocular and stereoscopic motion perception.

Main Methods:

  • Utilized random-dot stimuli for both binocular depth and monocular lateral motion.
  • Employed successive matching to compare perceived speeds at varying contrast levels.

Related Experiment Videos

  • Quantified the relationship between contrast reduction and perceived speed reduction.

    • Main Results:

    • The 'Thompson effect' was observed for both stereomotion and monocular lateral motion.
    • The magnitude of the contrast-induced speed reduction was similar across both motion types.
    • Perceived speed reduction due to contrast was proportional for 3D and 2D motion.

    Conclusions:

    • The monocular motion system significantly contributes to stereomotion perception.
    • The monocular system appears to dominate the speed percept, particularly for approaching motion.
    • Findings support a model where 2D motion processing influences 3D motion perception.