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When the left and the right eye receive incompatible images simultaneously, the observer typically reports perceiving one of the two images at a time, with perception switching between the eyes' images over time. These switches are accompanied by transient BOLD responses occurring across the whole brain, from the highest to the lowest levels of cortical visual processing. In parallel, the chain of cognitive events surrounding a perceptual switch is a complex one, ranging from causative processes to arousal, attention and motor response selection. To assess the relative functional roles of switch-related brain responses we investigated their time course and spatial specificity in detail. We acquired simultaneous fMRI (< 1s TR) and 1kHz eye tracking data from 9 subjects during a binocular rivalry task. It is known that a considerable proportion of switches is caused by blinks and eye movements, likely due to visual …