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The generation of words in speech involves a number of processing stages. There is, first, a stage of conceptual preparation; this is followed by stages of lexical selection, phonological encoding, phonetic encoding and articulation. In addition, the speaker monitors the output and, if necessary, self-corrects. Major parts of the theory have been computer modelled. The paper concentrates on experimental reaction time evidence in support of the theory.
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Willem J. M. Levelt (1996) studied this question.