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Gesture-speech physics in fluent speech and rhythmic upper limb movements.

Wim Pouw1,2,3, Lisette de Jonge-Hoekstra1,4,5, Steven J Harrison1,6

  • 1Center for the Ecological Study of Perception and Action, University of Connecticut, Storrs, Connecticut.

Annals of the New York Academy of Sciences
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Physical forces from arm movements influence speech production, increasing vocal loudness and pitch. These findings suggest a biomechanical link between gesture and speech, impacting how we communicate.

Keywords:
biomechanicsentrainmenthand gesturespeech acousticsspeech production

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Area of Science:

  • Biomechanics
  • Speech Science
  • Human Communication

Background:

  • Hand-gesture and speech coordination is typically viewed as learned.
  • Recent studies show biomechanical coupling between arm movements and vocalization in simple utterances.
  • This coupling affects respiratory activity, influencing vocal F0 and intensity.

Purpose of the Study:

  • To investigate the impact of gesture-speech physics on fluent speech production.
  • To determine if limb movement impulses affect vocal F0 and amplitude envelope.
  • To explore the relationship between movement characteristics and acoustic speech features.

Main Methods:

  • An experiment involving 37 participants producing fluent, self-formulated speech.
  • Participants rhythmically moved their limbs (arm vs. wrist) while speaking.
  • Acoustic analysis of speech (F0, amplitude envelope) was correlated with movement parameters (impulse, deceleration).

Main Results:

  • Fluent speech with limb movement showed heightened F0 and amplitude envelope compared to nonmovement.
  • Effects were more pronounced with higher-impulse arm movements than lower-impulse wrist movements.
  • Acoustic peaks coincided with peak movement impulse, particularly during deceleration phases.

Conclusions:

  • Physical impulses from gestures demonstrably affect the speech system during fluent speech.
  • Higher deceleration rates in arm movements correlated with higher acoustic peaks.
  • Findings support a biomechanical basis for gesture-speech coordination, with implications for communication evolution.