CHARLES I. ABRAMSON is Assistant Professor of Psychology at Oklahoma State University. He is the author of Invertebrate Learning: A Laboratory Manual,/i> (1990) and ,i>A Primer of Invertebrate Learning: The Behavioral Perspective (1994). ZHANNA P. SHURANOVA is on the faculty at the Institute of Higher Nervous Activity and Neurophysiology of the Russian Academy of Sciences in Moscow. She is the author of Neurophysiology of the Crayfish (1988) and Progress in Crustacean Neurobiology (1991). YURI M. BURMISTROV is on the faculty at the Institute of Information Transmission Problems of the Russian Academy of Sciences in Moscow./e With his collaborator, Zhanna Shuranova, he is the author of Neurophysiology of the Crayfish (1988) and Progress in Crustacean Neurobiology (1991).