[Perception, expression and psychosomatic functions].

The investigation starts with the mind/body-problem and with epistemological peculiarities of psychophysical processes. Every monism has to be conceived at least as a dualism of properties. As a special kind of dualism the functionalism is an example against the type/type-identity thesis but not against the token-/token-identity thesis. But the last one is no serious alternative for genuine psychological methods. But also the functionalism does not offer a complete psychological theory: there is an ambivalence concerning the secondary qualities and also concerning intentionality. Bodily expressions were analyzed according the semiotic theory of Charles Sanders Peirce.