What is a hallmark feature of apraxia of speech (AOS) when distinguishing it from dysarthria?

• A. Inconsistent articulation errors and prominent groping, with relatively preserved language and strength.
• B. Consistent articulation errors with no groping.
• C. Marked weakness of facial muscles with reduced strength.
• D. Monotone voice with uniform rate.

Answer: (A)

Apraxia of speech is a motor planning problem, so the defining feature is that speech errors are inconsistent and often accompanied by visible or audible attempts to “grope” or search for the right sounds. This searching behavior, along with variable misarticulations, happens while language content and overall oral strength stay relatively intact. That combination—inconsistent errors with groping and preserved language/strength—is what sets AOS apart from other motor speech disorders.

If articulation errors were consistent and there was no groping, that pattern would point more toward dysarthria, which comes from neuromuscular execution problems and tends to produce steady, predictable errors. Marked facial weakness likewise suggests a basic motor weakness rather than the planning trouble seen in AOS. A monotone or uniformly paced voice can occur with several conditions, but it isn’t the hallmark feature used to distinguish AOS from dysarthria.