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When two different images are presented to the two eyes at the corresponding retinal locations, observers often experience binocular rivalry - alternating perception of the two images. In a number of behavioral and neuroimaging experiments using binocular rivalry as a tool, we showed that object category information is available in the brain from the suppressed images, and observers' spatial attention could be guided by certain types of invisible images. With a frequency-tagged SSVEP measure, we also demonstrated that when attention was diverted away from the competing stimuli, binocular rivalry ceased and interocular competition remain unresolved.