Which statement best summarizes the motor speech features of dysarthria?

• A. It results from deficits in motor planning rather than muscle weakness.
• B. It is primarily characterized by inconsistent, highly variable misarticulations.
• C. It involves slow, weakness, incoordination, or altered tone of the speech musculature.
• D. It only affects voice quality without affecting articulation.

Answer: (C)

Dysarthria is a motor speech disorder arising from neuromuscular impairment that affects how the speech muscles move. The key features reflect the state of the muscles involved in speech: movements are slow, the muscles may be weak, coordination among the lips, tongue, jaw, and laryngeal structures can be imperfect, and tone can be altered (too tight or too lax). This combination explains imprecise articulation, reduced intelligibility, and changes in prosody and voice quality that accompany the disorder.

The statement that best summarizes these motor speech features is that dysarthria involves slow movement, weakness, incoordination, or altered tone of the speech musculature. The other options point to different issues: motor planning deficits describe apraxia of speech rather than dysarthria, inconsistent misarticulations are more typical of apraxia, and saying it only affects voice quality ignores the broader impact on articulation and resonance.