A disconnection between the phonetic lexicon and the speech motor system causes

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Conduction aphasia is caused by a disconnection between the phonetic lexicon and the speech motor system, making it difficult to repeat words or phrases despite intact comprehension and fluent spontaneous speech. Broca's aphasia is caused by damage to the frontal lobe and affects the production of speech, while Wernicke's aphasia is caused by damage to the temporal lobe and affects language comprehension. Global aphasia is a more severe form that affects both comprehension and production of language.

A Disconnection Between the Phonetic Lexicon and the Speech Motor