What is a noticeable quality of phonation in spastic dysarthria?

• A. High pitch and airy voice
• B. Strained vocal quality and low pitch
• C. Soft and gentle tone
• D. Crisp and clear phonation

Answer: (B)

In spastic dysarthria, a noticeable quality of phonation is characterized by a strained vocal quality and often a low pitch. This condition arises due to the damage of the upper motor neurons, which leads to increased muscle tone and stiffness. The resultant hypertonicity affects the vocal folds, making them struggle to vibrate freely, thus producing a strained and effortful voice.

In this context, the low pitch can also be attributed to the excessive tension in the laryngeal muscles, which restricts normal vocal fold function. The combination of strain and a lowered pitch can make speech sound effortful, hoarse, or harsh. This distinct vocal quality is an essential aspect of diagnosing and understanding spastic dysarthria, as it can help differentiate this type of dysarthria from others that exhibit different phonatory characteristics.