Excised larynx experimentation: history, current developments, and prospects for bioacoustic research

Garcia, Maxime; Herbst, Christian T.

doi:10.1537/ase.171216

Cited by 9 publications

(2 citation statements)

References 104 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To our best knowledge, all previous studies in excised human or animal larynges introduced a degree of vocal fold tension in order to improve the adduction of their membranous part (for review, see ref. 24 ).…”

Section: Discussionmentioning

confidence: 99%

Contact Pressure Between the Vocal Folds in Reinke's Edema: Experimental Observations on an Excised Human Larynx

et al. 2021

View full text Add to dashboard Cite

To analyze the range of values of the contact pressure between the membranous vocal folds with Reinke's edema and to compare it to those observed in the absence of such a lesion. Methods. Two human larynges were separately tested on the experimental bench, one of them with a bilateral loose swelling of the vocal folds. Once in a glottal prephonatory configuration, airflow was increased until achievement of self-sustained oscillations while recording aerodynamic, acoustic, electroglottographic data, and contact pressure between the folds. Results. We observed well-documented variations in acoustical parameters, as the decrease of the fundamental frequency and the increase of the phonation threshold pressure. The results of the study also point to a significant increase in the amplitude of the contact pressure in presence of the Reinke's edema, and a lower degree of harmonicity of the produced sounds. Conclusion. This is the first report of ex vivo study of a larynx with Reinke's edema. It highlights the increase in the contact pressure during phonation, which possibly contributes to sustain the lesion once it appeared.

show abstract

Section: Discussionmentioning

confidence: 99%

Contact Pressure Between the Vocal Folds in Reinke's Edema: Experimental Observations on an Excised Human Larynx

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Only recently has EGG been used in vitro in several studies with excised larynges (Garcia and Herbst, 2018), specifically targeting questions of animal bioacoustics in a number of non-human primates (Herbst et al, 2012;Garcia et al, 2017), as well as prototypical application of the method in birds (Elemans et al, 2015;Rasmussen et al, in preparation). In vivo, the methodology has, to the knowledge of the authors, only been applied twice before.…”

Section: Electroglottography: Application In Non-human Primatesmentioning

confidence: 99%

Non-invasive documentation of primate voice production using electroglottography

Herbst

Dunn

2018

Self Cite

View full text Add to dashboard Cite

Vocal communication in non-human primates has long been of interest to both academic researchers and the broader public. This interest exists for two principle reasons. Firstly, we have an intrinsic curiosity over how these animals, which are so closely related to us, communicate with one another. Secondly, and perhaps more importantly, understanding vocal communication in our primate relatives provides us with important insight into the evolution of human speech-a topic that has fascinated humans for centuries.Speech does not fossilize, and studying the evolution of this complex, yet critical aspect of human behavior using proxies from the fossil record (e.g. the shape of the skull or hyoid (Fitch, 2000a;Nishimura, 2003)) has led to little consensus (Fitch, 2000b;Hauser et al., 2002). A more powerful approach is provided by the comparative method, the primary tool used by Darwin to analyze evolutionary phenomena (Darwin, 1859(Darwin, , 1871. Comparative analyses use data from extant species to draw inferences about extinct ancestors and evolutionary processes. Several important advances in our understanding of the evolution of speech have been made using comparative data (Ghazanfar and Hauser, 1999;Fitch, 2000b;Fitch et al., 2016;Ghazanfar et al., 2012;Takahashi et al., 2013).Humans, non-human primates, most other mammals (Herbst et al., 2012), and even birds (Elemans et al., 2015) produce sound according to a universal physical principle, described by the myoelastic aerodynamic (MEAD) theory (van den Berg, 1958;Titze, 1980). Steady airflow, coming from the lungs, is converted into a sequence of airflow pulses by the passively vibrating vocal folds (or other laryngeal or syringeal tissue), resulting in self-sustained oscillation. The acoustic pressure waveform generated by this sequence of flow pulses excites the vocal tract, which filters the pulses acoustically, and the result is radiated from the mouth (and/ or the nose) (Story, 2002). The latter phenomenon, involving the individual contributions of the laryngeal sound source and the vocal tract to the quality of the emitted sound, has been described in the source-filter theory of sound production (Fant, 1960) Abstract Electroglottography (EGG) is a low-cost, non-invasive method for documenting laryngeal sound production during vocalization. The EGG signal represents relative vocal fold contact area and thus delivers physiological evidence of vocal fold vibration. While the method has received much attention in human voice research over the last five decades, it has seen very little application in other mammals. Here, we give a concise overview of mammalian vocal production principles. We explain how mammalian voice production physiology and the dynamics of vocal fold vibration can be documented qualitatively and quantitatively with EGG, and we summarize and discuss key issues from research with humans. Finally, we review the limited number of studies applying EGG to non-human mammals, both in vivo and in vitro. The potential of EGG for non-invasive assessm...

show abstract

Primate Vocal Anatomy and Physiology: Similarities and Differences Between Humans and Nonhuman Primates

Nishimura

2020

The Origins of Language Revisited

View full text Add to dashboard Cite

Excised larynx experimentation: history, current developments, and prospects for bioacoustic research

Cited by 9 publications

References 104 publications

Contact Pressure Between the Vocal Folds in Reinke's Edema: Experimental Observations on an Excised Human Larynx

Contact Pressure Between the Vocal Folds in Reinke's Edema: Experimental Observations on an Excised Human Larynx

Non-invasive documentation of primate voice production using electroglottography

Primate Vocal Anatomy and Physiology: Similarities and Differences Between Humans and Nonhuman Primates

Contact Info

Product

Resources

About