Affiliation: | 1. Graduate Groups of Psychology and Neuroscience, University of Pennsylvania, 3720 Walnut Street, Philadelphia, PA 19104, USA;2. Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania, 3720 Walnut Street, Philadelphia, PA 19104, USA;3. Department of Psychiatry, Yale University School of Medicine and Connecticut Mental Health Center, 34 Park Street, New Haven, CT 06508, USA |