A study examining pupillary contagion in patients with Williams syndrome, compared to typically developing children and adults.

Eye contact is an essential element for us to connect with others emotionally. It helps us better understand the feelings and thoughts of the other person and enhances positive feelings related to social interaction. When two people make eye contact, their pupils adapt and change in size according to each other’s pupil size. This phenomenon is called pupillary contagion. It can appear as early as four months after birth and helps to build social connections, empathy, and mutual trust in social interactions.

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