Supraglottic vocal tract shaping in the production of brazilian portuguese vowels: data from magnetic resonance imaging / Configuração do trato vocal supraglótico na produção das vogais do português brasileiro: dados de imagens de ressonância magnética

AUTOR(ES)

Fabiana Nogueira Gregio

DATA DE PUBLICAÇÃO

2006

RESUMO

To characterize the supraglottic vocal tract shaping in the production of the seven oral and five nasal vowels of brazilian portuguese from the articulatory point of view by means of magnetic resonance imaging (MRI). Methods: The subject of this study, one female native speaker of brazilian portuguese, had no previous alterations of speech, language or of neurological and auditory systems and with neither dental nor articulator alterations. The magnetic resonance images, collected during the production of the vowels sustained by the speaker, were analyzed for articulatory characterization. The results were considered according to articulatory and acoustic data researched in the related literature. Results and discussion: The nasal vowels, unlike the oral ones, presented three different moments, which are characterized by changes in the position of the articulators during their production; while the oral vowels presented only one moment/phase. The oral vowels, when compared to the nasal, maintained similar characteristics, being articulatorily classified by the position of their tongue-surface (both vertically and horizontally), by the opening of the oral cavity, by the rounding of the lips and by the position of the soft palate. The vowels that presented the greater differences, when compared to their oral and nasal counterparts, were [a]-[ã], [o]-[õ] and [u]-[uâ]. Production of nasal vowels took a longer time than their oral counterparts yielding a larger number of frames captured. Conclusion: Data obtained by means of MRI has allowed the analysis of the movements of the articulators during the production of the vowels contributing to: increasing the knowledge of brazilian portuguese vowels production mechanisms; characterizing the brazilian portuguese vowels inventory; providing insights to the evaluation and rehabilitation of speech disorders

ASSUNTO(S)

fala speech fonoaudiologia speech, language and hearing sciences imagem por ressonância magnética lingua portuguesa -- brasil magnetic resonance imaging linguistica aplicada imagem por ressonancia magnetica cavidade nasal nasal cavity lingua portuguesa -- fonetica fonética phonetics fala

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