1. From the Department of Psychology (Drs. Holroyd and Labus) and the College of Osteopathic Medicine (Dr. Cordingley), Ohio University, Athens; Headache Treatment and Research (Drs. Holroyd and O'Donnell) and Ortho Neuro Inc. (Dr. O'Donnell), Westerville, Ohio; and the Department of Psychiatry and Behavioral Sciences, University of California, Los Angeles (Dr. Labus).