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Context and the motion aftereffect: occlusion cues in the test pattern alter perceived direction
Maarten J van der Smagt1, Gene R Stoner
1Vision Center Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037-1099, USA.
Perception
|April 2, 2002
Summary
Depth cues alter motion perception. The motion aftereffect (MAE) direction shifts towards near surfaces, but less strongly than real motion, impacting depth-motion theories.
Area of Science:
- Visual perception
- Neuroscience
- Computational vision
Background:
- Depth cues influence the perception of motion direction for visual stimuli.
- The motion aftereffect (MAE) is an illusory motion perceived after viewing a moving stimulus.
Purpose of the Study:
- To investigate how depth-ordering cues affect the motion aftereffect (MAE).
- To compare the influence of depth cues on MAE with their influence on real motion perception.
Main Methods:
- Participants adapted to a horizontally moving vertical grating viewed through a diamond-shaped aperture.
- Depth-ordering cues (occluding 'near' or 'far' surfaces) were introduced at aperture boundaries.
- Participants reported the perceived direction of the MAE after adaptation.
Main Results:
- Depth-ordering cues shifted the perceived MAE direction towards the 'near' surface.
- The influence of depth cues on MAE was generally weaker than on the perception of real motion.
- This suggests distinct processing for MAE and direct motion perception regarding depth information.
Conclusions:
- Depth-ordering cues modulate the direction of the motion aftereffect.
- The interaction between depth perception and motion aftereffects is less pronounced than for direct motion perception.
- Findings inform theories on the integration of depth and motion information in the visual system.