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Contact: Catherine West
cwest@psychologicalscience.org
202-783-2077
Association for Psychological Science
Caption: tamarin grasping the stem of a plastic champagne glass to pull the glass from the apparatus in order to extract a marshmallow stuck inside the glass. In (a), the monkey exhibits the thumb-up grasp orientation, and in (b), the monkey exhibits the thumb-down grasp orientation.
Credit: Dan Weiss
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