1. UCLA-Caltech Medical Scientist Training Program (Spivak), Department of Neurosurgery, David Geffen School of Medicine (Spivak, Bari), and Department of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience and Human Behavior (Spivak, Kuhn), University of California, Los Angeles; School of Biological and Health Systems Engineering, Arizona State University, Tempe (Tyler).