Spectrographic and nasometric profiles of the vowel [a] its counterpart [ã] in experimental conditions of the velopharyngeal coupling / Perfil espectrográfico e nasométrico da vogal [a] e sua contraparte [ã] em diferentes condições de abertura velofaríngea

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Hypernasality is a resonance disorder due to the coupling between the oral and nasal cavities, usually associated to velopharyngeal dysfunction. The relationship between size of velopharyngeal opening and speech hypernasality is not a well understood phenomenon. Particularly, little is known between the acoustic profiles of vowels under differents conditions of velopharyngeal opening. The objective of this study is to describe the acoustic profile of the vowel [a] and its counterpart [ã], during speech production under different, but controlled, sizes of velopharyngeal opening. This study involved the acoustic and auditory-perceptual analysis of the speech of a single subject with incomplete operated cleft palate and a remaining velopharyngeal insufficiency treated with a speech bulb. The subjects speech appliance was duplicated allowing for the introduction of openings of controlled sizes in the bulb (10 MM POT.2, 20 MM POT.2e 30 MM POT.2). Two minimal-pair words with the vowel [a] and two with the vowel [ã] produced within a phrase were used as speech corpus leading to a total of 136 speech samples analyzed in this study. Controlling size of velopharyngeal opening was important in the definition of the acoustic profile og hypernasal speech, however, the results of this study did not indicate a linear relation between size of velopharyngeal opening and nasalance scores not with formant or duration measures.

ASSUNTO(S)

nasometry cleft palate espectrografia spectrography velopharyngeal opening nasometria prótese de palato formante fissura hipernasalidade hypernasality speech bulb

ACESSO AO ARTIGO

Documentos Relacionados