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Pupil constriction

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Pupillary constriction or constriction of the pupil is a physiological response that decreases the size of the pupil of the eye via the iris dilator muscle. It can have a variety of causes. It may be a reaction to exposure to reduced light. Or it may indicate reduced interest in the subject of attention or indicate sexual stimulation.[1]

Psychological factors associated with pupil conctriction

References

  1. Hess, Eckhard H.; Polt, James M. (5 August 1960), "Pupil Size as Related to Interest Value of Visual Stimuli", Science 132 (3423): 349, doi:10.1126/science.132.3423.349 

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