Morphometric Correlations of the Voice Category (VC) in Professional Singers with Oropharyngeal and Laryngeal Anatomy Using Stroboscopy and Cervical Posteroanterior Radiography

Zarachi, Athina; Tafiadis, Dionysios; Ziavra, Nafsika; Kastanioudakis, Ioannis; Dimakis, Efthymis; Liontos, Angelos; Argyropoulou, Maria I.; Exarchakos, Georgios

doi:10.4236/ijohns.2021.104026

Cited by 3 publications

(1 citation statement)

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“…groups of individuals share large-scale shape features. The existence of laryngeal morphotypes among humans has been hypothesized, mostly in the context of structural adaptations for specific voice categories (6, 47, 49, 50). The sources of such morphological variation were largely unknown but this study demonstrated a quantitative approach validate cluster identity.…”

Section: Discussionmentioning

confidence: 99%

Post-pubertal developmental trajectories of laryngeal shape and size in humans

Riede¹,

Stein

Baab³

et al. 2022

Preprint

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Laryngeal morphotypes have been hypothesized related to both phonation and to laryngeal pathologies. Morphotypes have not been validated or demonstrated quantitatively and sources of shape and size variation are incompletely understood but could be critical for the explanation of behavioral changes (e.g., changes of physical properties of a voice) and for therapeutic approaches to the larynx. Therefore results are likely to have implications for surgeons and speech language pathologists. A stratified human sample was interrogated for phenotypic variation of the vocal organ. First, computed tomography image stacks were used to generate three-dimensional reconstructions of the thyroid cartilage. Then cartilage shapes were quantified using multivariate statistical analysis of high dimensional shape data from margins and surfaces of the thyroid cartilage. The effects of sex, age, body mass index (BMI) and body height on size and shape differences were analyzed. We found that sex, age, BMI and the age-sex interaction showed significant effects on the mixed sex sample. Among males, only age showed a strong effect. The thyroid cartilage increased in overall size, and the angulation between left and right lamina decreased in older males. Age, BMI and the age-height interaction were statistically significant factors within females. The angulation between left and right lamina increased in older females and was smaller in females with greater BMI. A cluster analysis confirmed the strong age effect on larynx shape in males and a complex interaction between the age, BMI and height variables in the female sample. The investigation demonstrated that age and BMI, two risk factors in a range of clinical conditions, are associated with shape and size variation of the human larynx. The effects influence shape differently in female and male larynges. The male-female shape dichotomy is partly size-dependent but predominantly size-independent.

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Section: Discussionmentioning

confidence: 99%

Post-pubertal developmental trajectories of laryngeal shape and size in humans

Riede¹,

Stein

Baab³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

Post-pubertal developmental trajectories of laryngeal shape and size in humans

Riede

Stein

Baab

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Laryngeal morphotypes have been hypothesized related to both phonation and to laryngeal pathologies. Morphotypes have not been validated or demonstrated quantitatively and sources of shape and size variation are incompletely understood but are critical for the explanation of behavioral changes (e.g., changes of physical properties of a voice) and for therapeutic approaches to the larynx. This is the first study to take this crucial step and results are likely to have implications for surgeons and speech language pathologists. A stratified human sample was interrogated for phenotypic variation of the vocal organ. First, computed tomography image stacks were used to generate three-dimensional reconstructions of the thyroid cartilage. Then cartilage shapes were quantified using multivariate statistical analysis of high dimensional shape data from margins and surfaces of the thyroid cartilage. The effects of sex, age, body mass index (BMI) and body height on size and shape differences were analyzed. We found that sex, age, BMI and the age–sex interaction showed significant effects on the mixed sex sample. Among males, only age showed a strong effect. The thyroid cartilage increased in overall size, and the angulation between left and right lamina decreased in older males. Age, BMI and the age–height interaction were statistically significant factors within females. The angulation between left and right lamina increased in older females and was smaller in females with greater BMI. A cluster analysis confirmed the strong age effect on larynx shape in males and a complex interaction between the age, BMI and height variables in the female sample. The investigation demonstrated that age and BMI, two risk factors in a range of clinical conditions, are associated with shape and size variation of the human larynx. The effects influence shape differently in female and male larynges. The male–female shape dichotomy is partly size-dependent but predominantly size-independent.

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Register transitions in an in vivo canine model as a function of intrinsic laryngeal muscle stimulation, fundamental frequency, and sound pressure level

Schlegel,

Berry,

Moffatt

et al. 2024

The Journal of the Acoustical Society of America

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Phonatory instabilities and involuntary register transitions can occur during singing. However, little is known regarding the mechanisms which govern such transitions. To investigate this phenomenon, we systematically varied laryngeal muscle activation and airflow in an in vivo canine larynx model during phonation. We calculated voice range profiles showing average nerve activations for all combinations of fundamental frequency (F0) and sound pressure level (SPL). Further, we determined closed-quotient (CQ) and minimum-posterior-area (MPA) based on high-speed video recordings. While different combinations of muscle activation favored different combinations of F0 and SPL, in the investigated larynx there was a consistent region of instability at about 400 Hz which essentially precluded phonation. An explanation for this region may be a larynx specific coupling between sound source and subglottal tract or an effect based purely on larynx morphology. Register transitions crossed this region, with different combinations of cricothyroid and thyroarytenoid muscle (TA) activation stabilizing higher or lower neighboring frequencies. Observed patterns in CQ and MPA dependent on TA activation reproduced patterns found in singers in previous work. Lack of control of TA stimulation may result in phonation instabilities, and enhanced control of TA stimulation may help to avoid involuntary register transitions, especially in the singing voice.

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Morphometric Correlations of the Voice Category (VC) in Professional Singers with Oropharyngeal and Laryngeal Anatomy Using Stroboscopy and Cervical Posteroanterior Radiography

Cited by 3 publications

References 93 publications

Post-pubertal developmental trajectories of laryngeal shape and size in humans

Post-pubertal developmental trajectories of laryngeal shape and size in humans

Post-pubertal developmental trajectories of laryngeal shape and size in humans

Register transitions in an in vivo canine model as a function of intrinsic laryngeal muscle stimulation, fundamental frequency, and sound pressure level

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