Publications of Aude Lagier
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See detailCross-sectional swallowing study in patients with disorders of consciousness
MELOTTE, Evelyne ULiege; Delhalle, Sabrina; Gosseries, Olivia ULiege et al

Poster (2018, September 29)

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See detailApproche expérimentale de la collision entre les plis vocaux en phonation et du phonotraumatisme : Études in vivo et sur larynx humains excisés
Lagier, Aude ULiege

Doctoral thesis (2016)

The collision between the vocal folds during phonation is a physiological phenomenon with a powerful role in the synchronization of their vibration. This collision is also a component of the phonotrauma ... [more ▼]

The collision between the vocal folds during phonation is a physiological phenomenon with a powerful role in the synchronization of their vibration. This collision is also a component of the phonotrauma. The role of phonotrauma in the pathophysiology of dysphonia is commonly accepted but its nature still unclear and its quantification remains difficult. This work proposes, an in vivo study in healthy subjects, and ex vivo ones on excised human larynges. The purpose of this work was to study the laryngeal behavior when the larynx is subjected to extremely high subglottic pressure. In vivo, the shouted voice was recorded with constant measure of subglottic pressure. Ex vivo, the subglottic pressure was directly manipulated independently from other parameters. The ex vivo study required a methodological development to modernize the experimental bench used for animal larynges studies and to adapt it to the human larynx. The results showed, in healthy speakers the existence of a "plateau" in the vocal intensity and in the electroglottographic signal for very high levels of subglottic pressure. The studies on excised larynges measured the collision force between the vocal folds and its changes depending on subglottic pressure. They also highlighted the existence of a "plateau" in the collision force when subglottic pressure was very high. The observations presented in this work are, to our knowledge, unprecedented. They have important clinical interest for understanding the concept of phonotrauma. Their interpretation in physical terms remains very incomplete. [less ▲]

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See detailThe shouted voice: A pilot study of laryngeal physiology under extreme aerodynamic pressure.
Lagier, Aude ULiege; Legou, Thierry; Galant, Camille et al

in Logopedics, Phoniatrics, Vocology (2016)

Introduction: The objective was to study the behavior of the larynx during shouted voice production, when the larynx is exposed to extremely high subglottic pressure. Materials and methods: The study ... [more ▼]

Introduction: The objective was to study the behavior of the larynx during shouted voice production, when the larynx is exposed to extremely high subglottic pressure. Materials and methods: The study involved electroglottographic, acoustic and aerodynamic analyses of shouts produced at maximum effort by three male participants. Results and discussion: Under a normal speaking voice, the voice sound pressure level (SPL) is proportional to the subglottic pressure. However, when the subglottic pressure reached high levels, the voice SPL reached a maximum value and then decreased as subglottic pressure increased further. Furthermore, the electroglottographic signal sometimes lost its periodicity during the shout, suggesting irregular vocal fold vibration. [less ▲]

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