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So if you ask someone to tell you their favorite color and the year they were born, their response times should be about the same. Their pupils get bigger. Pupil dilation is a reliable indicator of lying since enlarged pupils are a sign that your brain is working hardâwhich it has to do in order for you to tell a lie.
What do an orgasm, a multiplication problem and a photo of a dead body have in common? Each induces a slight, irrepressible expansion of the pupils in our eyes. For more than a century scientists have known that our eyes' pupils respond to more than changes in light. They also betray mental and emotional commotion. In fact, pupil dilation correlates with arousal so consistently that researchers use pupil size, or pupillometry, to investigate a wide range of psychological phenomena. And they do this without knowing exactly why our eyes behave this way.