Contrast asynchronies juxtapose color and color contrast information. The basic configuration of a contrast asynchrony consists of two identical disks whose luminance levels change in time from light to dark and back again; one disk is surrounded by a bright field and the other by a dark field; at 1Hz, observers report seeing the disks modulating in antiphase, yet also becoming light and dark at the same time. While such a configuration may look like a dynamic brightness illusion, the actual effect occurs because the visual system separates the in-phase luminance information from the antiphase contrast information. Variations of the contrast asynchrony paradigm can isolate different types of visual responses information.
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