'Constricting the pupil feels like gripping, tensing something making it larger feels like fully releasing, relaxing the eye,' D.W. didn't notice that he had this ability until he played computer games for long periods of time. told Strauch and his colleagues at Ulm University. 'I showed a friend that I can 'tremble' with my eyeballs, and he noticed that my pupils became small,' D.W. realized that he could change the size of his pupils.
When he was about 15 or 16 years old, the young man - identified in the case report by his initials, D.W. (Strauch was previously a doctoral student at Ulm University). But no one thought it was possible to change pupil size by directly controlling it like a muscle - that is, until a student of psychology at Ulm University in Germany contacted Strauch after taking one of his courses.
