The Eye Pupil Adjusts to Expanding Hole Patterns

The eye pupil adjusts to a loserly expanding holes. When the hole was this shade of black, 86% of participants in the study felt as though the darkness was headed towards them. The authors say they aren't sure why 14% of the group didn't perceive any illusory expansion when the hole was black. They tracked the eye movements of participants and it revealed their pupils were unconsciously dilating at the site of the black blob.