1. Departments of Neurology,
2. Physiology,
3. Neurology Research Laboratories, Veterans Affairs Medical Center, Ann Arbor, Michigan 48105
4. Center for Sensory-Motor Interaction, Aalborg University, 9220 Aalborg, Denmark; and
5. Biostatistics, University of Michigan, Ann Arbor, Michigan 48109;
6. Psychiatry,
7. Internal Medicine, and