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Integration of motion information during binocular rivalry
Timothy J Andrews1, Colin Blakemore
1Department of Psychology, University of Durham, Stockton Campus, Durham TS17 6BH, UK. tim.andrews@durham.ac.uk
Vision Research
|January 26, 2002
Summary
Independent presentation of drifting gratings to each eye can still elicit pattern motion, suggesting binocular interaction. This occurs even when only one grating
Area of Science:
- Visual perception
- Neuroscience
- Computational vision
Background:
- Superimposing two moving gratings typically results in perceived motion in a single direction.
- The mechanisms underlying this pattern motion when gratings are presented to both eyes independently are not fully understood.
Purpose of the Study:
- To investigate if the same mechanism underlies pattern motion when drifting gratings are presented independently to each eye.
- To differentiate between direct motion signal influence versus integration of directional information from monocular components.
Main Methods:
- Experiment 1: Presented large (4-deg) circular drifting grating patches independently to each eye.
- Experiment 2: Used very small (1-deg) grating stimuli to mimic mosaic patches and varied contrast and spatial frequency.
Main Results:
- Large patches induced periods of monocular dominance and a fluid mosaic perceived as moving in a single direction (pattern motion).
- Small patches, despite monocular form perception, still resulted in pattern motion on about one-third of trials.
- Decreased pattern motion was observed when grating contrast and spatial frequency differed significantly.
Conclusions:
- Binocular interactions for form and motion operate independently.
- Motion signals from a perceptually suppressed grating can influence perceived pattern motion.
- The brain integrates directional information from contiguous monocular patches to perceive coherent pattern motion.