Paul Churchland is Professor of Philosophy at the University of California, San Diego. H is the author of Science Realism and the Plasticity of Mind (1979). Matter and Consciousness (1988), A Neurocomputational Perspective (1989), and The Engine of Reason, the Seat of the Soul (1995). Patricia Churchland is a Professor of Philosophy at the University of California, San Diego, and Adjunct Professor of Salk Institute. She is the author of Neurophilosophy (1986) and (with T.J. Sejnowski) The Computational Brain (1992). Robert N. McCauley is Massee-Martin/NEH Professor of Philosophy and Adjunct Professor of Psychology and Anthropology at Emery University. He has published numerous articles and reviews in Epistemology and the philosophies of science, social science, and psychology. He is the author (with E. Thomas Lawson) of Rethinking Religion (1990).