slightly dm armstrong david kellogg lewis formulated version functionalism analyzed mental concepts folk psychology terms functional roles finally wittgenstein 's idea meaning use led version functionalism theory meaning developed wilfrid sellars gilbert harman another one psychofunctionalism approach adopted naturalistic philosophy mind associated jerry fodor zenon pylyshyn mental states characterized causal relations mental states sensory inputs behavioral outputs functionalism abstracts away details physical
Humanities Philosophy Metaphysics Philosophy of mind