Relationship With Binocular Rivalry
Flash suppression occurs due to the conflict between the inputs to the two eyes. When this conflict is sustained without any abrupt events, binocular rivalry occurs. In both flash suppression and binocular rivalry, perceptual conflict between the two eyes is required for the perceptual effect. If two similar images are used, fusion of the two images is experienced, rather than flash suppression or binocular rivalry. Despite some similarities in perceptual consequences, the neuronal mechanisms responsible for the two illusions can be different. For example, the strength (depth) of flash suppression seems much stronger than that of binocular rivalry. Comparative studies of the two methods are needed.
Flash suppression has certain methodological advantages over binocular rivalry as a tool for probing conscious vision. Whereas the percept during binocular rivalry alternates stochastically, the percept during flash suppression is precisely controlled in time.
Although flash suppression allows one to present an image to someone without his or her seeing it consciously, it requires a to-be-erased image to be presented for a fraction of second before introducing of a new image. This requirement limits the usage of flash suppression for the study of nonconscious visual processing.
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