Investigating Laryngeal "Tilt" on Same-pitch Phonation-Preliminary Findings of Vocal Mode Metal and Density Parameters as Alternatives to Cricothyroid-Thyroarytenoid "Mix".

Investigating Laryngeal "Tilt" on Same-pitch Phonation-Preliminary Findings of Vocal Mode Metal and Density Parameters as Alternatives to Cricothyroid-Thyroarytenoid "Mix".:

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Investigating Laryngeal "Tilt" on Same-pitch Phonation-Preliminary Findings of Vocal Mode Metal and Density Parameters as Alternatives to Cricothyroid-Thyroarytenoid "Mix".

J Voice. 2019 Sep;33(5):806.e9-806.e21

Authors: Mathias Aaen, McGlashan J, Sadolin C

Abstract

OBJECTIVES: The objective of this work was to study the parameters "metal" and "density" and their combinatory conditions in relation to the vocal modes Overdrive, Edge, and Curbing from the pedagogical method Complete Vocal Technique by means of laryngostroboscopic imaging, high-speed videoendoscopy, electroglottography (EGG), long-time-average spectrum (LTAS), and acoustics.

STUDY DESIGN: This is a three-subject exploratory study.

METHODS: Three singers were recorded performing various metal and density conditions of Overdrive, Edge, and Curbing from the Complete Vocal Technique method by means of laryngostroboscopic imaging using a videonasoendoscopic camera system and the Laryngostrobe program, high-speed videoendoscopy, EGG, LTAS, and acoustic signals using SpeechStudio.

RESULTS: A laryngeal tilt was discovered as related to the condition of "reduced density" on same-pitch phonation, with observations of the thyroid cartilage tilting forward, stretching of the mucosa covering the cricoid-arytenoid complex and the posterior cricoid, and an upward posterior, slightly superior, contraction of the middle constrictor muscle in the pharyngeal wall. A resulting associated reduced contact quotient was observed on EGG, as well as a lowered mean sound pressure level. On LTAS, the laryngeal tilt was associated with a decrease of spectral energy in areas between the 7th and the 20th harmonic. The subjects of the study were able to perform the tilt without changing pitch or volume.

CONCLUSIONS: Singers can perform laryngeal tilt during same-pitch phonation in the vocal modes Overdrive, Edge, and Curbing. The parameters of density and metal establish a more precise and anatomically grounded terminology than "mix register."

PMID: 30122461 [PubMed - indexed for MEDLINE]