Binocular rivalry (BR) refers to the spontaneous, unpredictable fluctuations in visual awareness provoked by dissimilar stimulation of the two eyes. Reports of the phenomenon date back several centuries, but interest in BR has exploded in recent years as researchers in diverse disciplines—psychology, neuroscience, medicine, philosophy—have found reasons to study it. New ideas about BR have emerged, sparking controversies about its neural bases, which may be resolved thanks to new methodological developments. This essay provides a synopsis of some key empirically determined aspects of BR as well as an overview of theoretical developments in this field. Work published during the past decade or so is emphasized (and explicitly referenced); earlier key findings are mentioned and referenced in the annotated bibliography included in the Supplemental Material.
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