Different feelings, emotions, and thoughts can all cause different "ticks" in our physical appearance. Many of these "ticks" occur in the eyes whether it be blinking or looking down. Another of these "ticks" is the expansion of the pupil of the eye making it bigger. It is nothing knew for scientists to know that the pupil will get bigger due to things other than a change in the light. Pupil dilation doesn't come from the same part of the nervous system as the cortex which takes in an image and sends it to the brain. The enlargement of the pupil is something out of conscious control. It moves the iris in order to take in different amounts of light. Different lighting can cause the pupil to shrink below two millimeters and other times grow to about eight millimeters in the dark. Although the changes in the pupil when cause my emotions and thoughts is usually a difference of less than a millimeter it can still help to recognize psychological phenomena.
When you are asked a question your pupils will enlarge in proportion to how hard the question is and will shrink back to normal once you finish the question. In this way pupils show the amount of mental strain someone is going through as they try to solve a problem. Scientist have now run studies where they believe they can come close to knowing what the person is feeling or thinking before the person does based on how their pupils look and expand. The study of the pupils is known as pupillometry and scientists are continuously working harder and harder to be able to understand and tell what a person is feeling just by their pupils. It has not got to the point yet of being able to be used for everyday situations because the pupils can be so small but if you look close enough, according to Men's Health Magazine, it can let guys know when they should "make their move."
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