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Binocular rivalry suppression disrupts recovery from motion adaptation
1Department of Psychology, Vanderbilt University, Nashville, TN 37240.
Visual Neuroscience
|August 1, 1992
Summary
The motion aftereffect (MAE) is prolonged when a test target is rendered invisible by binocular rivalry. This indicates that suppressed visual information does not prevent MAE storage, impacting models of visual perception.
Area of Science:
- Neuroscience
- Visual Perception
- Psychophysics
Background:
- The motion aftereffect (MAE) is a visual illusion where prolonged exposure to motion in one direction leads to perceiving motion in the opposite direction.
- MAE storage, where the aftereffect persists longer due to a delay before testing, is a known phenomenon.
- The role of visual suppression, particularly during binocular rivalry, in MAE storage remains unclear.
Purpose of the Study:
- To investigate whether the motion aftereffect (MAE) can be stored when the test target is perceptually invisible due to binocular rivalry.
- To determine if a suppressed visual target during the storage period affects the decay of the MAE.
- To explore the implications for current models of MAE generation and storage.
Main Methods:
- Participants were adapted to a drifting grating to induce an MAE.
- An intervening period followed adaptation, with four conditions: (1) viewing the test target, (2) eye occlusion, (3) viewing the test target and a rival stimulus in the other eye (rivalry), and (4) both eyes occluded.
- The duration of the residual MAE was measured after the intervening period in each condition.
Main Results:
- MAE duration was significantly longer in the binocular rivalry condition compared to the normal MAE condition.
- MAE duration in the rivalry condition was comparable to the condition where both eyes were occluded (stored MAE).
- These findings suggest that a suppressed target during binocular rivalry does not promote MAE decay.
Conclusions:
- The motion aftereffect (MAE) is stored even when the test target is rendered invisible by binocular rivalry.
- Visual suppression effectively prevents information about the test target from reaching the neural sites responsible for MAE storage.
- This supports the idea that while suppressed information may reach early visual processing areas, it does not influence the recovery of adapted neurons underlying the MAE.