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Language and thought

Study of how language influences thought

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The main use of language is to convey information. It can be used to transfer thoughts from one mind, to another mind, and to modify and explore thoughts within a mind. The bits of linguistic information that enter one person's mind from another cause people to entertain a new thought with profound effects on their world knowledge, inferencing, and subsequent behavior. In the act of speaking, thought comes first, and spoken or written language is an expression that follows. Language has certain limitations, and humans cannot express all that they think. Writing was a powerful new invention because it enabled revision of language and allowed an initial thought to be conveyed, reviewed, and revised before it is expressed.

Language can also be used for thought by framing and modifying thinking with a precision that was not possible without language.

Language of thought

Language of thought theories rely on the belief that mental representation has linguistic structure. Thoughts are "sentences in the head" and so take place within a mental language. Two theories work in support of the language of thought theory. Causal syntactic theory of mental practices hypothesizes that mental processes are causal processes defined over the syntax of mental representations. Representational theory of mind hypothesizes that propositional attitudes are relations between subjects and mental representations. In tandem, these theories explain how the brain can produce rational thought and behavior. All three of those theories were inspired by the development of modern logical inference. They were also inspired by Alan Turing's work on causal processes that require formal procedures within physical machines.

The language of thought hypothesis hinges on the belief that the mind works like a computer, always in computational processes. The theory believes that mental representation has both a combinatorial syntax and compositional semantics. The claim is that mental representations possess combinatorial syntax and compositional semantic—that is, mental representations are sentences in a mental language. Turing's work on physical machines implementation of causal processes that require formal procedures was modeled after these beliefs.

Another prominent linguist, Steven Pinker, developed the idea of a mental language in his book The Language Instinct (1994). Pinker refers to the mental language as "mentalese". In the glossary of his book, Pinker defines mentalese as a hypothetical language that is used specifically for thought. The hypothetical language houses mental representations of concepts such as the meaning of words and sentences.

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