This article describes research supported in part by DARPA under ONR contract N00014-94-01-0994 and a National Science Foundation Fellowship. This work was developed using MRI data provided by Martha Shenton, Jane Anderson, and Robert W. McCarley, Department of Psychiatry and Surgical Planning Lab of Brigham & Women's Hospital, and Brockton VA Medical Center. The authors would like to acknowledge Dr. Shenton's NIMH grants, K02 M-01110 and R29 MH-50747, and Dr. McCarley's grant, R01-40799, and the Brockton Schizophrenia Center for the Department of Veterans Affairs.