Socrates and Descartes on Dualism Dualism means the complete separation of the mental world and the physical world. In philosophy, it is the theory that the universe is explicable only as a whole composed of two distinct and mutually exclusive factors: the mind and the body. Socrates and Plato are called dualists because they think that mind and body are separate and distinct substances. Mind is conscious and non-spatial and body is spatial but not conscious. While separate, these two substances interact. Both Socrates and Descartes argue that the mind and body are separable and imm