12/5/2023 0 Comments Constricted eye pupils![]() ![]() The iris is a muscle in the eye that functions like the diaphragm of a camera (see Figure 1). The pupil is the opening at the center of the eye that appears as a black dot surrounded by the colored part of the eye, the iris. The opening at the center of your eye allows light to enter it, enabling you to gather information about the world around you, but the opposite is true, too-insights can be gained about what is going on in your brain based on the behavior of your pupils. As you will discover, the small opening at the center of your eyes can tell us a whole lot about what is happening in your brain! In this article, we will discuss how pupils function, how they respond to environmental stimuli, and how their reactions are reflective of cognitive processing-that is, the inner workings and computations going on in the mind. The pupils also respond when people ingest certain drugs, when they feel strong emotions, when they retrieve a memory, or when they are concentrating or thinking very hard about something. But environmental responses-like the response to light-are just the tip of the iceberg. ![]() When the environment is bright, the pupil constricts, and when it is dim, the pupil dilates. But a lesser known fact about the pupil is that by closely examining how it constricts (gets smaller) and dilates (gets larger) in response to certain stimuli, scientists can gain crucial insights about what is going on in the brain. Your pupil, the opening at the center of your eye, allows you to gather information from the world around you.
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