Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions

Herbst, Christian T.; Hampala, Vit; Garcia, Maxime; Hofer, Riccardo; Švec, Jan G.

doi:10.3791/55303

Cited by 7 publications

(6 citation statements)

References 36 publications

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“…During the excised larynx experiments we used red deer (cervus elaphus) larynges. These larynges were shown to behave similarly as human larynges 54,55 . The larynges were harvested from animals living wildly in forests, which were hunted by the Czech Army Forest Service during a regular hunting season, and they were treated in accordance with the standard ethical requirements of the Palacký University in Olomouc.…”

Section: Acoustic Measurementsmentioning

confidence: 76%

Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations

Lehoux

Hampala

Švec

2021

Sci Rep

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Excised larynges serve as natural models for studying behavior of the voice source. Acoustic resonances inside the air-supplying tubes below the larynx (i.e., subglottal space), however, interact with the vibratory behavior of the larynges and obscure their inherent vibration properties. Here, we explore a newly designed anechoic subglottal space which allows removing its acoustic resonances. We performed excised larynx experiments using both anechoic and resonant subglottal spaces in order to analyze and compare, for the very first time, the corresponding subglottal pressures, electroglottographic and radiated acoustic waveforms. In contrast to the resonant conditions, the anechoic subglottal pressure waveforms showed negligible oscillations during the vocal fold contact phase, as expected. When inverted, these waveforms closely matched the inverse filtered radiated sound waveforms. Subglottal resonances modified also the radiated sound pressures (Level 1 interactions). Furthermore, they changed the fundamental frequency (fo) of the vocal fold oscillations and offset phonation threshold pressures (Level 2 interactions), even for subglottal resonance frequencies 4–10 times higher than fo. The obtained data offer the basis for better understanding the inherent vibratory properties of the vocal folds, for studying the impact of structure-acoustic interactions on voice, and for validation of computational models of voice production.

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Section: Acoustic Measurementsmentioning

confidence: 76%

Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations

Lehoux

Hampala

Švec

2021

Sci Rep

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“…To our knowledge there are no absolute VFCA measurements reported for human vocal folds, only for dogs (Gunter, 2003;Jiang and Titze, 1994). Different techniques have been used to determine VFCA in dogs and deer (Hampala et al, 2016;Herbst et al, 2017a;Jing et al, 2017;Shau et al, 2001). However, because we can image LVM dynamics simultaneously from different angles, birds provide an excellent model system to study the kinematics and control of voiced sound production.…”

Section: Discussionmentioning

confidence: 99%

Quantifying syringeal dynamicsin vitrousing electroglottography

Rasmussen

Herbst

Elemans

2018

Journal of Experimental Biology

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The complex and elaborate vocalizations uttered by many of the 10,000 extant bird species are considered a major driver in their evolutionary success, warranting study of the underlying mechanisms of vocal production. Additionally, birdsong has developed into a highly productive model system for vocal imitation learning and motor control, where, in contrast to humans, we have experimental access to the entire neuromechanical control loop. In human voice production, complex laryngeal geometry, vocal fold tissue properties, airflow and laryngeal musculature all interact to ultimately control vocal fold kinematics. Quantifying vocal fold kinematics is thus critical to understanding neuromechanical control of voiced sound production, but imaging of vocal fold kinematics in birds is experimentally challenging. Here, we adapted and tested electroglottography (EGG) as a novel tool for examining vocal fold kinematics in the avian vocal organ, the syrinx. We furthermore imaged and quantified syringeal kinematics in the pigeon () syrinx with unprecedented detail. Our results show that EGG signals predict (1) the relative amount of contact between the avian equivalent of vocal folds and (2) essential parameters describing vibratory kinematics, such as fundamental frequency, and timing of syringeal opening and closing events. As such, EGG provides novel opportunities for measuring syringeal vibratory kinematic parameters Furthermore, the opportunity for imaging syringeal vibratory kinematics from multiple planar views (horizontal and coronal) simultaneously promotes birds as an excellent model system for studying kinematics and control of voiced sound production in general, including in humans and other mammals.

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“…This set-up allows the researcher to see the contact area variation and air flow. 40 In this way, the imaging of excised larynges has been gradually developing from 2D to 3D.…”

Section: Basic Researchmentioning

confidence: 99%

Development of Excised Larynx

et al. 2020

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The larynx is a complex organ which has a role in a variety of functions such as phonation, breathing, and swallowing. To research these functions, it is widely accepted that in vivo studies provide more anatomically and physiologically relevant findings. However, invasive procedures are generally needed to measure variables such a subglottal pressure, vocal fold tension and stiffness, and cricothyroid muscle stretch. Performing studies using excised larynges is a useful technique which makes it possible to not only measure phonation parameters but control them as well. Early studies using excised larynges mainly focused on controlling specific parameters and mathematical modeling simulations. The use of these studies has helped further research in laryngeal anatomy, imaging techniques, as well as aerodynamic, acoustic, and biomechanical properties. Here, we describe the progress of this research over the past five years. The number of accepted animal models has increased and ideas from excised larynx studies are starting to be applied to treatment methods for laryngeal disorders. These experiments are only valid for an excised situation and must continue to be combined with animal experimentation and clinical observations

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Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions

Cited by 7 publications

References 36 publications

Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations

Subglottal pressure oscillations in anechoic and resonant conditions and their influence on excised larynx phonations

Quantifying syringeal dynamicsin vitrousing electroglottography

Development of Excised Larynx

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