Which feature is most diagnostic of motor-based planning errors in AOS?

• A. Groping with variable articulation
• B. Fluent speech with no errors
• C. Consistent substitutions without groping
• D. Normal prosody

Answer: (A)

Groping with variable articulation is the clearest sign of motor-based planning problems in apraxia of speech. When planning the precise sequence of movements for each sound, the speaker often searches and experiments with different articulatory configurations, leading to visible effort and inconsistently produced sounds across attempts. This trial-and-error groping reflects disrupted motor planning rather than a simple weakness or a phonological issue. That’s why this feature is most diagnostic: it captures the core struggle of AOS—finding the right motor plan for fluent, accurate speech. In contrast, fluent speech with no errors would indicate preserved planning; consistent substitutions without groping point to phonological encoding problems rather than planning, and normal prosody would not align with the timing difficulties often seen in AOS.