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Updated: Oct 1, 2025
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Published on: December 2, 2011
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Static and dynamic formant scaling conveys body size and aggression
Andrey Anikin1,2, Katarzyna Pisanski2, David Reby2
1Division of Cognitive Science, Lund University, Lund, Sweden.
Royal Society Open Science
|March 4, 2022
Summary
To sound intimidating, extending the vocal tract consistently is more effective than dynamic changes. Listeners perceive consistent vocal tract elongation as larger and more aggressive.
Area of Science:
- Evolutionary biology
- Acoustic phonetics
- Human and animal communication
Background:
- Humans and animals use vocalizations to signal aggression and size.
- Extending the vocal tract lowers voice resonance frequencies (formants), creating an illusion of larger body size.
Purpose of the Study:
- Investigate the effectiveness of static versus dynamic vocal tract length changes on perceived size and aggression.
- Determine how listeners interpret within-call alterations in apparent vocal tract length.
Main Methods:
- Compared perceptual effects of static and dynamic formant scaling in aggressive human speech and nonverbal vocalizations.
- Acoustically manipulated vocalizations to simulate vocal tract elongation or shortening from a resting position.
Main Results:
- Gradual formant scaling, regardless of direction, suggested smaller size and greater aggression.
- Vocal tract shortening conveyed smaller size and less aggression; elongation conveyed larger size and more aggression.
- Static scaling effects were stronger than dynamic scaling effects.
Conclusions:
- Within-call vocal tract scaling influences perceived emotion (aggression).
- Consistent vocal tract extension is a more effective strategy for conveying a large and intimidating presence than dynamic scaling.
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