Although they are often grouped together in comparison with non-dualist theories, Plato's soul-body dualism, and Descartes' mind-body dualism, are fundamentally different. The doctrines examined are those of the Phaedo and the Meditations. The main difference, from which others flow, lies in Plato's acceptance and Descartes' rejection of the assumption that the soul (= intellect) is identical with what animates the body.