1. Departments of Psychology, Veterinary and Comparative Anatomy, Pharmacology, and Physiology, and Program in Neuroscience, Washington State University, P.O. Box 644820, Pullman, WA 99164-4820, USA,
2. Departments of Psychology, Veterinary and Comparative Anatomy, Pharmacology, and Physiology, and Program in Neuroscience, Washington State University, P.O. Box 644820, Pullman, WA 99164-4820, USA