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While human participants were making an attractiveness judgment on faces, their pupil constricted more for the more attractive (as-to-be-rated) faces. Further experiments showed that the effect of pupil constriction to attractiveness judgment extended to intrinsically esthetic visual objects such as natural scene images (as well as faces) but not to line-drawing geometric figures. When participants were asked to judge the roundness of faces, pupil constriction still correlated with their attractiveness but not the roundness rating score, indicating the automaticity of the pupil constriction to attractiveness. When pupillary responses were manipulated implicitly by relative background luminance changes (from the prestimulus screen), the facial attractiveness ratings were in accordance with the amount of pupil constriction, which could not be explained solely by simultaneous or sequential luminance contrast. The overall results suggest that pupil constriction not only reflects but, as a part of self-monitoring and attribution mechanisms, also possibly contributes to facial attractiveness implicitly.<\/jats:p>","DOI":"10.1162\/jocn_a_01649","type":"journal-article","created":{"date-parts":[[2020,11,9]],"date-time":"2020-11-09T14:52:41Z","timestamp":1604933561000},"page":"315-340","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":19,"title":["Attractiveness in the Eyes: A Possibility of Positive Loop between Transient Pupil Constriction and Facial Attraction"],"prefix":"10.1162","volume":"33","author":[{"given":"Hsin-I","family":"Liao","sequence":"first","affiliation":[{"name":"NTT Corporation, Atsugi, Kanagawa, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Makio","family":"Kashino","sequence":"additional","affiliation":[{"name":"NTT Corporation, Atsugi, Kanagawa, Japan"},{"name":"Tokyo 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