Rhesus Macaques Grooming (IMAGE) University of Pennsylvania Caption One rhesus macaque grooming another, the primary way these monkeys act prosocially toward one another. Work with these animals helped University of Pennsylvania researcher Michael Platt and other scientists draw their conclusions about the function of the amygdala. Credit Lauren Brent Usage Restrictions Must use accompanying credit information. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.