How do lexical tasks help in AOS assessment?

• A. They diagnose dysarthria
• B. They help determine whether language planning contributes to difficulty; preserved lexical retrieval with poor motor planning suggests AOS
• C. They assess hearing
• D. They measure working memory only

Answer: (B)

Focusing on how words are planned and produced, lexical tasks help separate language planning from motor planning in speech. In apraxia of speech, the challenge isn’t usually finding the right word; it’s programming the sequence of movements to say that word. So someone can retrieve a word normally but still struggle to articulate it correctly, showing groping, distorted sounds, and inconsistent errors. This pattern—normal lexical retrieval with impaired motor planning—strongly points to AOS. If lexical retrieval were impaired, that would suggest a language planning/aphasia issue rather than AOS. Lexical tasks don’t diagnose hearing or measure working memory alone, which is why they’re not about those functions.