Energy flows in gesture-speech physics: The respiratory-vocal system and its coupling with hand gestures

Pouw, W., Harrison, S. J., Esteve-Gibert, N., & Dixon, J. A. (2020). Energy flows in gesture-speech physics: The respiratory-vocal system and its coupling with hand gestures. The Journal of the Acoustical Society of America, 148(3): 1231. doi:10.1121/10.0001730.
Expressive moments in communicative hand gestures often align with emphatic stress in speech. It has recently been found that acoustic markers of emphatic stress arise naturally during steady-state phonation when upper-limb movements impart physical impulses on the body, most likely affecting acoustics via respiratory activity. In this confirmatory study, participants (Nā€‰=ā€‰29) repeatedly uttered consonant-vowel (/pa/) mono-syllables while moving in particular phase relations with speech, or not moving the upper limbs. This study shows that respiration-related activity is affected by (especially high-impulse) gesturing when vocalizations occur near peaks in physical impulse. This study further shows that gesture-induced moments of bodily impulses increase the amplitude envelope of speech, while not similarly affecting the Fundamental Frequency (F0). Finally, tight relations between respiration-related activity and vocalization were observed, even in the absence of movement, but even more so when upper-limb movement is present. The current findings expand a developing line of research showing that speech is modulated by functional biomechanical linkages between hand gestures and the respiratory system. This identification of gesture-speech biomechanics promises to provide an alternative phylogenetic, ontogenetic, and mechanistic explanatory route of why communicative upper limb movements co-occur with speech in humans. ACKNOWLEDGMENTS
Supplementary material
Link to Preprint on OSF
Publication type
Journal article
Publication date
2020

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