Psychophysical and pupillometric investigations of visual mechanisms underlying binocular integration

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Using interocular suppression phenomena such as binocular rivalry, this study investigated visual mechanisms underlying binocular integration and correlations between perceptual changes and pupillary responses. In the pupillometric experiments, we provided converging evidence supporting the idea that the pupillary response can be used as an objective index for investigating interocular suppression. Moreover, we showed that the pupillary response exhibits amplitude modulation correlated with changes in percept (brightness) as well as in physical stimulation. In the psychophysical experiments investigating visibility modulation of rivalrous stimuli, we clarified stimulus conditions favoring binocular integration based on the stimulated eye and those favoring integration based on stimulus features. The present results also suggested that the feature‐based binocular integration involves multiple visual processes, including the early processes encoding different aspects of visual stimuli separately as well as the processes selective to the combination of different features.