In AOS, what pattern would you expect on DDK tasks regarding rates and accuracy, especially with more complex sequences?

• A. Faster rates with perfect accuracy
• B. Slower AMR rates and variable accuracy with complex sequences
• C. No change in rates or accuracy
• D. Uniform accuracies across all sequence lengths

Answer: (B)

In apraxia of speech, the motor planning problems show up most clearly as slowed, unstable performance when you push for rapid, sequenced articulations. Diadochokinetic tasks test how fast and accurately someone can produce rapid speech movements, with alternating syllables or sequences. Because the core issue is planning and programming these rapid sequences, the rate slows and the accuracy becomes inconsistent, and this inconsistency grows as the sequences become more complex. So you’d expect slower rates on repetitive, single-syllable repetitions (AMR) and variable accuracy when trying more complex sequences, reflecting the instability in motor planning. The other patterns—faster rates with perfect accuracy, no change with sequence length, or uniform accuracy—don’t capture the characteristic variability and slowed execution seen in AOS.