A groundbreaking study has revealed that our pupils change size in sync with our breathing—a response now dubbed the "pupillary respiratory phase response." ...

Visual illusions of motion are a ... Every time you move your eyes or blink, your pupils "reset", leading to small changes in their size over the course of a second or two. In their new paper ...

Scientists at the Karolinska Institute in Sweden and the University of Groningen in the Netherlands have confirmed that pupil ...