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Binocular combination of second-order stimuli
Jiawei Zhou1, Rong Liu2, Yifeng Zhou2
1CAS Key Laboratory of Brain Function and Disease, and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, PR China ; McGill Vision Research, Department of Ophthalmology, McGill University, Montreal, Quebec, Canada.
Plos One
|January 10, 2014
Summary
Binocular vision combines first-order (luminance) and second-order (contrast) stimuli. This study reveals second-order stimuli combine linearly, suggesting post-monocular extraction processing in the brain.
Area of Science:
- Vision science
- Neuroscience
- Perception
Background:
- Phase information is crucial for visual stimuli.
- The binocular combination of second-order (contrast-modulated) stimuli remains unclear.
Purpose of the Study:
- To investigate the binocular combination of first- and second-order visual stimuli.
- To clarify the processing of contrast-modulated stimuli in binocular vision.
Main Methods:
- Binocular phase combination paradigm used in seven healthy adults.
- Measurement of binocular combination for luminance-modulated (first-order) and contrast-modulated (second-order) stimuli.
Main Results:
- Second-order gratings' perceived phase depends on interocular signal ratio, similar to first-order stimuli.
- Second-order stimulus combination is more linear than first-order.
- Binocular combination of second-order stimuli is consistent across correlated, anti-correlated, and uncorrelated carriers.
Conclusions:
- Binocular phase combination of second-order stimuli occurs after monocular extraction of modulations in adults.
- Sensory balance in second-order combination can be determined via binocular phase combination measurements.
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