- Speakers with higher-pitched voicesare judged to be less truthful, less emphatic, less potent and more nervous.
- Slower-talking speakers are judged to be less truthful, less persuasive, and more passive.
- Two speakers who utter exactly the same words but one speaks a little faster and louder and with fewer pauses and greater variation in volume will be judged to be more energetic, knowledgeable and intelligent.
- Expressive speech, with modulation in pitch and volume and with a minimum of noticeable pauses, boosts credibility and enhances the impression of intelligence.
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