How does intelligibility relate to AOS severity?

• A. Intelligibility is unaffected by AOS severity.
• B. Intelligibility improves as AOS severity increases.
• C. Intelligibility declines with age unrelated to AOS.
• D. Intelligibility typically worsens as AOS severity increases.

Answer: (D)

Intelligibility is about how easily someone listening can understand what is being said. In apraxia of speech, greater problems with planning and sequencing the movements needed for speech lead to more distorted and inconsistent articulation, longer pauses, and slower rate. As the severity of these motor planning difficulties increases, these disruptions become more frequent and harder to predict, making the speech less understandable. So, intelligibility typically worsens as AOS severity increases. The other ideas don’t fit because intelligibility is indeed affected by AOS and does not reliably improve with greater severity, and age unrelated to AOS doesn’t directly describe how intelligibility changes with the severity of the motor speech disorder.