In philosophy of mind, dualism is a set of views about the relationship between mind and matter, which begins with the claim that mental phenomena are, in some respects, non-physical.
Ideas on mind/body dualism by Jonas originate at least as far back as Zarathushtra. Plato and Aristotle deal with speculations as to the existence of an incorporeal soul that bore the faculties of intelligence and wisdom. They maintained, for different reasons, that people's "intelligence" (a faculty of the mind or soul) could not be identified with, or explained in terms of, their physical body.