Fodor's language of thought (LOT) hypothesis states that
cognition is a process of computation over compositional mental representations. This means that thoughts are represented in a "language" (sometimes known as mentalese) which allows complex thoughts to be built up by combining simpler thoughts in various ways. It is clear from the biology of the
brain that these mental representations are not present in the same way as symbols written on paper; rather, the LOT is supposed to exist at the cognitive level, the level of thoughts and concepts. For example the thought that "John is tall" is clearly composed of at least two sub-parts: the concept of John (the person), and the concept of tallness. The manner in which these two sub-parts are combined could be expressed in
first-order predicate calculus:T(j)
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A phrase coined by Fodor to voice the view that all mental representations
are linguistic expressions within an 'internal' language which
significantly resembles spoken language.
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Chris Eliasmith