Integrative Insights into the Myoelastic-Aerodynamic Theory and Acoustics of Phonation. Scientific Tribute to Donald G. Miller

Švec, Jan G.; Schutte, Harm K.; Chen, C. Julian; Titze, Ingo R.

doi:10.1016/j.jvoice.2021.01.023

Cited by 20 publications

(31 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The largest pressure drop occurred between divergent shape of the VF. This phenomenon is in an agreement with the concept of the myoelastic-aerodynamic theory of phonation [14,66,73] and with the recent experimental and computational results [4,19,27,52,69].…”

Section: Introductionsupporting

confidence: 90%

Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model

Hájek

Svancara

Horáček

et al. 2021

ACM

Self Cite

View full text Add to dashboard Cite

Finite-element modeling of self-sustained vocal fold oscillations during voice production has mostly considered the air as incompressible, due to numerical complexity. This study overcomes this limitation and studies the influence of air compressibility on phonatory pressures, flow and vocal fold vibratory characteristics. A two-dimensional finite-element model is used, which incorporates layered vocal fold structure, vocal fold collisions, large deformations of the vocal fold tissue, morphing the fluid mesh according to the vocal fold motion by the arbitrary Lagrangian-Eulerian approach and vocal tract model of Czech vowel [i:] based on data from magnetic resonance images. Unsteady viscous compressible or incompressible airflow is described by the Navier-Stokes equations. An explicit coupling scheme with separated solvers for structure and fluid domain was used for modeling the fluid-structure-acoustic interaction. Results of the simulations show clear differences in the glottal flow and vocal fold vibration waveforms between the incompressible and compressible fluid flow. These results provide the evidence on the existence of the coupling between the vocal tract acoustics and the glottal flow (Level 1 interactions), as well as between the vocal tract acoustics and the vocal fold vibrations (Level 2 interactions).

show abstract

Section: Introductionsupporting

confidence: 90%

Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model

Hájek

Svancara

Horáček

et al. 2021

ACM

Self Cite

View full text Add to dashboard Cite

show abstract

“…An important characteristic of myoelastic-aerodynamic systems [ 29 ] is the minimal pressure, aka phonation threshold pressure (PTP), needed to induce a behavior state change of the dynamical system from steady state to oscillating limit cycle. A lower PTP means a more efficient energy conversion from air flow to acoustic pressure [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Bats expand their vocal range by recruiting different laryngeal structures for echolocation and social communication

et al. 2022

View full text Add to dashboard Cite

Echolocating bats produce very diverse vocal signals for echolocation and social communication that span an impressive frequency range of 1 to 120 kHz or 7 octaves. This tremendous vocal range is unparalleled in mammalian sound production and thought to be produced by specialized laryngeal vocal membranes on top of vocal folds. However, their function in vocal production remains untested. By filming vocal membranes in excised bat larynges (Myotis daubentonii) in vitro with ultra-high-speed video (up to 250,000 fps) and using deep learning networks to extract their motion, we provide the first direct observations that vocal membranes exhibit flow-induced self-sustained vibrations to produce 10 to 95 kHz echolocation and social communication calls in bats. The vocal membranes achieve the highest fundamental frequencies (fo’s) of any mammal, but their vocal range is with 3 to 4 octaves comparable to most mammals. We evaluate the currently outstanding hypotheses for vocal membrane function and propose that most laryngeal adaptations in echolocating bats result from selection for producing high-frequency, rapid echolocation calls to catch fast-moving prey. Furthermore, we show that bats extend their lower vocal range by recruiting their ventricular folds—as in death metal growls—that vibrate at distinctly lower frequencies of 1 to 5 kHz for producing agonistic social calls. The different selection pressures for echolocation and social communication facilitated the evolution of separate laryngeal structures that together vastly expanded the vocal range in bats.

show abstract

“…Understanding sound production through the implication of different anatomical features is critical to build the evolutionary history of vocal communications in mammals and to explain the great diversity encountered (Borgard et al 2020). There are two theories of sound production and control: the source-filter theory (Titze and Martin 1998;Taylor and Reby 2010) and the myoelastic-aerodynamic (MEAD) theory (van den Berg 1958;Titze and Alipour 2006;Švec et al 2021).…”

mentioning

confidence: 99%

“…The MEAD theory provides complementary and detailed insights into understanding the variations of frequency in vocal production from a laryngeal source (Titze and Alipour 2006;Brown and Riede 2017;Švec et al 2021). The theory states that the larynx's differential muscle activities control the airflow needed for vocalisations by opening and closing the glottis (the vocal folds and the space between them).…”

mentioning

confidence: 99%

“…The theory states that the larynx's differential muscle activities control the airflow needed for vocalisations by opening and closing the glottis (the vocal folds and the space between them). The elasticity, together with the morphology of the vocal folds, are also the main components involved in the MEAD, as the vibratory properties of the membranes impact the sound production (Brudzynski 2009;Brown and Riede 2017;Švec et al 2021). The size and strength of the lungs furnish air flow and thus will affect the amplitude and frequency of the calls.…”

mentioning

confidence: 99%

See 1 more Smart Citation

The vocal apparatus of bats: an understudied tool to reconstruct the evolutionary history of echolocation?

Brualla¹,

Wilson²,

Doube³

et al. 2022

Preprint

View full text Add to dashboard Cite

Until recently, bat phylogeny separated megabats (laryngeally non-echolocators) and microbats (all laryngeal echolocators) into two distinct clades. This segregation was consistent with the assumption that laryngeal echolocation was acquired by a common ancestor and inherited by all microchiropterans. Thus, laryngeal echolocation was regarded to have evolved once. Recent advances in bat genome sequencing have added insights regarding the origin of bats and their phylogenetic relationships. The megabats previously thought to be phylogenetically isolated are now sharing a common ancestor with the superfamily Rhinolophoidea, which is constituted of laryngeal echolocators. This new relationship brings a counterpoint regarding the hypothesis of single origin of echolocation, which could have appeared several times independently. Concomitantly, recent studies in bat evolutionary developmental biology have illuminated the importance of characters from embryonic development to discussions of how and when echolocation evolved. Here, we describe how comparative chiropteran laryngeal morphology is a novel area of research that could improve the understanding of echolocation and may help resolve the evolutionary history of bats. This review provides morphological descriptions and comparisons of the larynx, bioacoustics interpretations, and newly developed visualisation approaches (i.e., contrast-enhanced computed tomography). We discuss the importance of understanding (1) laryngeal sound production so it may be linked with the evolution of the Chiropteran auditory system and (2) the evolution of laryngeal morphology to understand the ecological and behavioural aspects of bat biology.

show abstract

Integrative Insights into the Myoelastic-Aerodynamic Theory and Acoustics of Phonation. Scientific Tribute to Donald G. Miller

Cited by 20 publications

References 48 publications

Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model

Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model

Bats expand their vocal range by recruiting different laryngeal structures for echolocation and social communication

The vocal apparatus of bats: an understudied tool to reconstruct the evolutionary history of echolocation?

Contact Info

Product

Resources

About