15th International Congress of Phonetic Sciences (ICPhS-15)

Barcelona, Spain
August 3-9, 2003

Effects of Unilateral Vocal Fold Paralysis on Formant Frequencies: Evidence for Vocal Tract Modifications in Severely Breathy Voice

Dana M. Hartl (1), Shinji Maeda (2), Lise Crevier-Buchman (1)

(1) Laboratoire de Phonétique et Phonologie-CNRS, France
(2) ENST-CNRS, France

Unilateral vocal fold paralysis (UVFP) affects the characteristics of the voice source by causing phonatory air leakage resulting in a breathy voice quality. Our aim was twofold. First, to evaluate the changes in formant resonance frequencies for two patients in 3 conditions : (1) normal voice before onset of UVFP, (2) voice one week after onset of UVFP caused by thoracic surgery, and (3) one week after vocal fold medialization using the technique of autologous fat injection. Second, to investigate two possible causes of formant modifications - glottal air leakage and supraglottic constriction - using an acoustic simulation of the vocal tract, to determine the effects of these two different phenomena on formant frequencies. To our knowledge, this is the first report on formant frequencies to use the patient's own normal voice before paralysis as the reference.

Full Paper

Bibliographic reference.  Hartl, Dana M. / Maeda, Shinji / Crevier-Buchman, Lise (2003): "Effects of unilateral vocal fold paralysis on formant frequencies: evidence for vocal tract modifications in severely breathy voice", In ICPhS-15, 2369-2372.