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The aftereffect to relative motion does not show interocular transfer
L A Symons1, P M Pearson, B Timney
1Department of Psychology, Queen's University, Kingston, Ontario, Canada.
Perception
|January 1, 1996
Summary
The motion aftereffect, a visual illusion, is enhanced by relative motion during adaptation. However, this relative motion does not improve how the effect transfers between eyes, suggesting early visual processing.
Area of Science:
- Neuroscience
- Visual Perception
Background:
- The motion aftereffect (MAE) is a compelling visual illusion.
- Relative motion between a central moving stimulus and its surround is crucial for MAE generation.
Purpose of the Study:
- To investigate the role of relative motion in binocular aspects of the MAE.
- To determine if relative motion enhances interocular transfer of the MAE.
Main Methods:
- Subjects adapted to uniform random dot motion surrounded by a stationary annulus.
- Displays were manipulated for monocular or binocular presentation during adaptation and testing.
- Duration of the MAE was measured.
Main Results:
- Relative motion during adaptation significantly extended the monocular MAE duration.
- Relative motion did not augment interocular transfer of the MAE.
- Surround contours' presence during adaptation, not testing, enhanced the MAE.
Conclusions:
- The MAE is partly due to adaptation to relative motion early in the visual pathway, before binocular integration.
- Binocular integration does not appear to benefit from the relative motion signals driving the monocular MAE.