Our pupils change size in response to light levels in our environment, but it seems that just thinking about something bright or dark can have the same effect Science Is Magic, Random Questions, Deborah Harkness, Souls Trilogy, Keep Your Eyes Open, Stem Cell Research, Healthy Man, Window To The Soul, Different Meaning
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newscientist.com

Just thinking about bright objects changes the size of your pupils

Our pupils change size in response to light levels in our environment, but it seems that just thinking about something bright or dark can have the same effect

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