![]() In bright light, they contract so your eyes aren’t overexposed.Įssentially, your brain is constantly trying to anticipate what’s next, using visual cues like color and light intensity, according to the study. In the dark, they dilate to let in more light and allow you to see better. In everyday life, your pupils expand and contract without your knowledge, responding to different levels of brightness. With the perceived movement into a dark tunnel, viewers expect a change in illumination, so their pupils dilate. The study found that the black hole illusion works best with a magenta background. The study also looked at people’s responses when the black hole illusion had a colored background, even beating the white background for effectiveness. For the pupil response, this is also crucial, since moving into darkness is potentially dangerous (one cannot see),” Bruno Laeng, a psychology professor at the University of Oslo and an author of the study, tells Popular Mechanics. “If one assumes that the illusion creates an impression of moving toward a totally dark space, that would be something we are very familiar with, like entering a tunnel or a dark room. This study is consistent with 2012 work from the same research team, which examined reactions to the Asahi illusion. ![]() They published their work last month in the journal Frontiers in Human Neuroscience. With the help of an infrared eye tracker, the study authors found that people who had a stronger sense of rushing into a tunnel experienced greater pupil dilation. Most of the men and women who reported a response to the illusion also experienced pupil dilation. ![]() Psychologists at the University of Oslo in Norway tested the black-hole illusion on 50 people with normal vision. This Disney Robot Makes Eye Contact Like a Pro.Our Eyes See the World 15 Seconds in the Past.
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