In the study of loudness and dysarthria, which variable did the researchers focus on?

• A. The relationship to prosodic variation
• B. F0 declination and final-word lengthening
• C. Paragraph reading quality
• D. Focus on gender differences

Answer: (B)

The main idea is that researchers quantify how loudness affects prosody in dysarthric speech by focusing on two specific prosodic cues: F0 declination and final-word lengthening. F0 declination is the downward drift in pitch that often occurs across an utterance, a sensitive indicator of intonation and how loudness control can shape pitch patterns in speech. Final-word lengthening refers to lengthening the last word of an utterance, which can reflect emphasis and pacing shaped by loudness and motor speech limitations. In dysarthria, these prosodic features are commonly altered, so measuring them provides a precise way to capture how loudness interacts with prosody. The other options are less directly tied to these acoustic-prosodic markers: paragraph reading quality and gender differences describe broader or unrelated factors, while the relationship to prosodic variation is too general to pin down the specific variables the study targeted.