The researchers played erotic videos to the participants while monitoring their pupil size. Some research suggests that pupil dilation is one of these involuntary responses to arousal or attraction.įor example, one 2012 study recruited 325 men and women with varying sexual orientations. The autonomic nervous system triggers various involuntary responses during emotions, such as fear or arousal. Changes in emotion might cause pupil dilation. This can be a result of the fight-or-flight response, which is involuntary.Įye contact has long been central to human interactions. In other cases, the pupil might change throughout the day.įor example, emotions such as anxiety may also cause changes in pupil size. For example, someone with congenital aniridia will have larger pupils all the time, due to a deficiency of the surrounding iris. In some cases, the pupils will dilate permanently.
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