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Language

What is the Language of Thought Hypothesis?
LOTH is an empirical thesis about the nature of thought and thinking.
According to LOTH, thought and thinking are done in a mental language,
i.e. in a symbolic system physically realized in the brain of the relevant
organisms. In formulating LOTH, philosophers have in mind primarily the
variety of thoughts known as ‘propositional attitudes'. Propositional
attitudes are the thoughts described by such sentence forms as ‘S believes
that P', ‘S hopes that P', ‘S desires that P', etc., where ‘S' refers to
the subject 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 can now be formulated more exactly as a hypothesis about the nature
of propositional attitudes. It can be characterized as the conjunction of
the following three theses (A), (B) and (C):
(A) Representational Theory of Mind (RTM): (cf. Field 1978: 37, Fodor
1987: 17)
(1) Representational Theory of Thought: For each propositional attitude A,
there is a unique 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 mental 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 representational or
symbolic system which is such that...