Substance Dualism:	Mind and body are two different things. (Descartes, Moreland)
Idealism:	Minds and their ideas are all that exist. "Bodies" are just certain ideas in minds. (Berkeley)
Physicalism:	There is no mental substance. "Minds" are just physical things. (Churchland)
Identity Theory:	"Mental states are physical states of the brain." (P 254a) (a version of physicalism)
Property Dualism:	Mental states are non-physical properties of the brain.
Functionalism:	A mental state is any state that plays a certain causal role (function) in behavior.