Ventricular fold oscillations lower the vocal pitch in rhesus macaques

We carried out ex vivo and in vivo experiments to explore the functional role of the ventricular folds in sound production in macaques. In the ex vivo experiments, 29 recordings out of 67 showed that the ventricular folds co-oscillated with the vocal folds. Transitions from normal vocal fold oscilla...

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Veröffentlicht in:Journal of experimental biology 2023-06, Vol.226 (12)
Hauptverfasser: Miyazaki, Rintaro, Yoshitani, Tomoki, Kanaya, Mayuka, Miyachi, Shigehiro, Kaneko, Akihisa, Kinoshita, Yuki, Nakamura, Kanta, Nishimura, Takeshi, Tokuda, Isao T
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container_issue 12
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container_title Journal of experimental biology
container_volume 226
creator Miyazaki, Rintaro
Yoshitani, Tomoki
Kanaya, Mayuka
Miyachi, Shigehiro
Kaneko, Akihisa
Kinoshita, Yuki
Nakamura, Kanta
Nishimura, Takeshi
Tokuda, Isao T
description We carried out ex vivo and in vivo experiments to explore the functional role of the ventricular folds in sound production in macaques. In the ex vivo experiments, 29 recordings out of 67 showed that the ventricular folds co-oscillated with the vocal folds. Transitions from normal vocal fold oscillations to vocal-ventricular fold co-oscillations as well as chaotic irregular oscillations were also observed. The in vivo experiments indicated that the vocal-ventricular fold co-oscillations were also observed in two macaque individuals. In both ex vivo and in vivo experiments, the vocal-ventricular fold co-oscillations significantly lowered the fundamental frequency. A mathematical model revealed that the lowering of the fundamental frequency was caused by a low oscillation frequency inherent in the ventricular folds, which entrained the vocal folds to their low-frequency oscillations. From a physiological standpoint, the macaques may utilize the ventricular fold oscillations more frequently than humans. The advantages as well as disadvantages of using the ventricular folds as an additional vocal repertory are discussed.
doi_str_mv 10.1242/jeb.245630
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source MEDLINE; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection; Company of Biologists
subjects Animals
Heart Ventricles
Humans
Macaca mulatta
Sound
Vocal Cords
title Ventricular fold oscillations lower the vocal pitch in rhesus macaques
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