Richard J. Bodnar is professor and chair of the Department of Psychology at Queens College of the City University of New York. Kathryn Commons is a postdoctoral fellow in the Laboratory of Neurobiology and Behavior at the Rockefeller University. Donald W. Pfaff is professor and head of the Laboratory of Neurobiology and Behavior at the Rockefeller University. He is a fellow of the American Academy of Arts and Sciences and a member of the National Academy of Sciences.