Don M. Tucker is CEO and Chief Scientist of Electrical Geodesics, Inc., a manufacturer of dense-array electroencephalography systems. He is also a professor of psychology and associate director of the NeuroInformatics Center@the University of Oregon. His research examines neural mechanisms of human emotion and cognition. Address: Electrical Geodesics, Inc., 1600 Millrace Drive, Suite 307, University Research Park, Eugene, OR 97403. E-mail: dtucker@egi.com