Effects of a semioccluded vocal tract on laryngeal muscle activity and glottal adduction in a single female subject

Anne-Maria Laukkanen; Ingo R Titze; Henry Hoffman; Eileen Finnegan

doi:10.1159/000170080

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Effects of a semioccluded vocal tract on laryngeal muscle activity and glottal adduction in a single female subject

Journal article

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Effects of a semioccluded vocal tract on laryngeal muscle activity and glottal adduction in a single female subject

Anne-Maria Laukkanen, Ingo R Titze, Henry Hoffman and Eileen Finnegan

Folia phoniatrica et logopaedica, Vol.60(6), pp.298-311

2008

DOI: 10.1159/000170080

PMCID: PMC4629998

PMID: 19011306

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Abstract

Voice training exploits semiocclusives, which increase vocal tract interaction with the source. Modeling results suggest that vocal economy (maximum flow declination rate divided by maximum area declination rate, MADR) is improved by matching the glottal and vocal tract impedances. Changes in MADR may be correlated with thyroarytenoid (TA) muscle activity. Here the effects of impedance matching are studied for laryngeal muscle activity and glottal resistance. One female repeated [pa:p:a] before and immediately after (a) phonation into different-sized tubes and (b) voiced bilabial fricative [beta:]. To allow estimation of subglottic pressure from the oral pressure, [p] was inserted also in the repetitions of the semiocclusions. Airflow was registered using a flow mask. EMG was registered from TA, cricothyroid (CT) and lateral cricoarytenoid (LCA) muscles. Phonation was simulated using a 7 x 5 x 5 point-mass model of the vocal folds, allowing inputs of simulated laryngeal muscle activation. The variables were TA, CT and LCA activities. Increased vocal tract impedance caused the subject to raise TA activity compared to CT and LCA activities. Computer simulation showed that higher glottal economy and efficiency (oral radiated power divided by aerodynamic power) were obtained with a higher TA/CT ratio when LCA activity was tuned for ideal adduction.

Voice - physiology

Voice Disorders - etiology

Glottis - physiopathology

Humans

Vocal Cords - physiology

Phonation - physiology

Sound Spectrography

Computer Simulation

Female

Laryngeal Muscles - physiopathology

Vocal Cord Paralysis - physiopathology

Electromyography

Vocal Cord Paralysis - etiology

Voice Disorders - physiopathology

Details

Title: Subtitle: Effects of a semioccluded vocal tract on laryngeal muscle activity and glottal adduction in a single female subject
Creators: Anne-Maria Laukkanen - Department of Speech Communication and Voice Research, University of Tampere, Tampere, Finland. Anne-Maria.Laukkanen@uta.fi
Ingo R Titze
Henry Hoffman
Eileen Finnegan
Resource Type: Journal article
Publication Details: Folia phoniatrica et logopaedica, Vol.60(6), pp.298-311
DOI: 10.1159/000170080
PMID: 19011306
PMCID: PMC4629998
NLM abbreviation: Folia Phoniatr Logop
ISSN: 1421-9972
eISSN: 1421-9972
Publisher: Switzerland
Grant note: R01 DC004224-11 / NIDCD NIH HHS R01 DC004224-10 / NIDCD NIH HHS R01 DC 04436 / NIDCD NIH HHS R01 DC004224-10S1 / NIDCD NIH HHS R01 DC004224 / NIDCD NIH HHS R01 DC004224-09 / NIDCD NIH HHS
Language: English
Date published: 2008
Academic Unit: School of Music; Communication Sciences and Disorders; Radiation Oncology; Otolaryngology
Record Identifier: 9984002407902771

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