Why do we make eye-contact?
When two people in conversation attend to each other, their pupils begin to dilate in synchrony. When that synchrony peaks, we make eye contact and then rapidly desynchronize. This suggests that eye contact may help us toggle between being “in sync” and thinking independently.
Sophie Wohltjen, Thalia Wheatley
Proceedings of the National Academy of Sciences (PNAS)
September 9, 2021