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Reading minds from eyesPupil responses and microsaccades reveal cognitive functions 
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Eyes are windows to the soul. In addition to eye movements such as saccades, the eyes have various tinny and unaware activities, including pupil responses and microsaccades. These eye activities reflect our internal states and brain activities, which are known to be in charge of functions related to attention and alertness. Based on this knowledge, we aim to use these eye movement characteristics to infer people’s mental states. Here we introduce two studies demonstrating how these unaware eye movements reflect auditory attention and facial attractiveness judgment. With the advance of eye movement recording technology, we may apply our findings to daily life scenarios to infer people’s cognitive functions.
[1] H.-I. Liao, H. Fujihira, S. Yamagishi, Y.-H. Yang, S. Furukawa, “Seeing an auditory object: Pupillary light response reflects covert attention to auditory space and object,” Journal of Cognitive Neuroscience, Vol. 35, No. 2, pp. 276-290, 2023.
[2] H.-I. Liao, M. Kashino, S. Shimojo, “Attractiveness in the eyes: A possibility of positive loop between transient pupil constriction and facial attraction,” Journal of Cognitive Neuroscience, Vol. 33, No. 2, pp. 315-340, 2021.
Hsin-I Liao
Sensory Representation Research Group, Human Information Science Laboratory