Mirror Display in the Squirrel Monkey, Saimiri sciureus

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Science  13 Nov 1964:
Vol. 146, Issue 3646, pp. 950-952
DOI: 10.1126/science.146.3646.950


Male squirrel monkeys may display the erect phallus under various conditions of courtship, aggression, and salutation. One variety will display consistently to its reflection in a mirror. Such display has a typical pattern and can sometimes be triggered by reflection of but one eye. A mirror display test has beenz designed for experimentation on the brain.