3 Dualist schools of thought

Argues that the mind is an independently existing substance - the mental does not have extension in space, and the material cannot think. This is the type of Dualism most famously defended by Descartes, and it is compatible with most theologies which claim that immortal souls occupy an independent "realm" of existence distinct from that of the physical world.

sserts that mental events are causally inert (i.e. have no physical consequences). Physical events can cause other physical events, and physical events can cause mental events, but mental events cannot cause anything, since they are just causally inert by-products of physical events which occur in the brain (i.e. epiphenomena) of the physical world. This doctrine was first formulated by Thomas Henry Huxley in the 19th Century, although based on Thomas Hobbes' much earlier Materialism theories.