Why does aphasia selectively impair a patient's ability to retrieve verbs compared to nouns when describing actions performed with tools?

💡 Explanation

Aphasia can cause selective deficits due to the neural organization of language. Verb retrieval during action descriptions depends on sensorimotor cortex integration; because tool-related actions recruit these circuits, damage impairs verb access. Therefore, impaired verb retrieval is the outcome, rather than noun retrieval which relies more on semantic networks.

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