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What is the Language of Thought conjecture? LOTH is an empirical thesis about the nature of thought and thinking. accord to LOTH, thought and thinking are done in a amiable language, i.e. in a symbolic system physically realized in the brain of the relevant organisms. In formulating LOTH, philosophers have in mind in general the variety of thoughts known as bidal posts. Propositional attitudes are the thoughts described by such(prenominal) sentence forms as S believes that P, S hopes that P, S desires that P, etc., where S refers to the resign of the attitude, P is any sentence, and that P refers to the proposition that is the object of the attitude. If we let A stand for such attitude verbs as believe, desire, hope, intend, think, etc., then the propositional attitude statements all have the form S As that P. LOTH passel now be formulated more exactly as a hypothesis about the nature of propositional attitudes. It can be characterized as the concurrence of the following th ree theses (A), (B) and (C) (A) figurative Theory of Mind (RTM) (cf. Field 1978 37, Fodor 1987 17) (1) mimetic Theory of Thought For each propositional attitude A, there is a erratic and distinct (i.e. dedicated)1 psychological relation R, and for all propositions P and subjects S, S As that P if and only if there is a psychogenic representation P such that (a) S bears R to P, and (b) P means that P. (2) Representational Theory of Thinking Mental processes, thinking in particular, consists of causal sequences of tokenings of mental representations. (B) Mental representations, which, as per (A1), constitute the direct "objects" of propositional attitudes, belong to a depictive or symbolic system which is such that (cf. Fodor and Pylyshyn 198812-3) (1) representations of the system have a combinatorial syntax and semantics structurally complex (molecular) representations are systematically build up out of structurally simple (nuclear) constituents, and the semantic conte nt of a molecular representation is a function of the semantic content of its atomic constituents together with its syntactic/formal complex body part, and (2) the operations on representations (constituting, as per (A2), the sphere of mental processes, thinking) are causally sensitive to the syntactic/formal structure of representations defined by this combinatorial syntax. (C) Functionalist Materialism. Mental representations so characterized are, at around suitable level, functionally characterizable entities that are realized by the physical properties of the subject having