Which symptom indicates incoordination in ataxic dysarthria?

• A. Stuttering
• B. Rhythmic tremor
• C. Sustained phonation
• D. Normal speech patterns

Answer: (B)

In ataxic dysarthria, the primary symptom indicating incoordination is a rhythmic tremor. This type of tremor arises from a disruption in the cerebellar control of motor function, which is essential for smooth and coordinated movements necessary for speech. Rhythmic tremor can manifest during speech production, leading to irregularities in pitch and loudness, giving the voice a shaky or quavering quality that reflects the underlying motor coordination issues typical of ataxic dysarthria.

Other symptoms, like stuttering, while they may relate to different speech disorders, do not specifically indicate incoordination characteristic of ataxic dysarthria. Sustained phonation typically tests the strength and stability of the voice but does not directly showcase the type of motor control issues seen in ataxic dysarthria. Normal speech patterns signify effective coordination and control, which would not be a symptom of ataxic dysarthria. Therefore, rhythmic tremor is the correct indication of incoordination in this specific dysarthria.