Correlatos perceptivos e acústicos de qualidade e dinâmica vocal na fala de crianças usuárias de implante coclear

• Autor(a) principal: Pessoa, Aline Neves
• Data de Publicação: 2012
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da PUC_SP
• Texto Completo: https://tede2.pucsp.br/handle/handle/13607
• topic: Qualidade vocal; Implante coclear; Percepção Auditiva; Acústica da fala; Voice quality; Cochlear implant; Auditory perception; Speech acoustics; CNPQ::LINGUISTICA, LETRAS E ARTES::LINGUISTICA::LINGUISTICA APLICADA

in the context of speech therapy and audiology devoted to the assistance of hearing impairment children (HI) and users of cochlear implants (CI), this research approaches perceptual and production aspects of speech based on the Phonetic Sciences. It focuses on the variability of patterns within the speech of children and presents the prosodic description by detailing the voice quality settings and the voice dynamics elements. Objective: to describe the perceptual correlates of the speech signal of children with HI and users of CI through the voice quality and voice dynamics, taking into account: factors related to clinic prediction of outcomes according to particularities of each child, the resulting changes throughout the therapy and data comparison of HI children and users of CI with normal hearing children. Methodology: the data is composed of audio recordings of semi-spontaneous speech samples of 8 children with HI and users of CI within the chronological age range of 2 years and 10 months and 7 years and 7 months. The corpus was digitalized with sampling frequency of 22050 Hz and 16 bits and recorded as wav extension through the Sound Forge Edit software (v7.0). The perceptual analysis consists on voice quality and voice dynamics jugdgements performed through of the Vocal Profile Analysis Scheme for Brazilian Portuguese (VPAS-PB). Those samples underwent also an auditory judgement taskconcerning the naturalness, accuracy and easiness of speech comprehension through a deferential semantic scale. The acoustic analysis was conducted through the ExpressionEvaluator script applied to the software PRAAT v.10. The perceptual data underwent also a statistical analysis through the software XLStat by using analysis of agglomerative hierarchical cluster, canonical correlation and discriminating analysis. Results: from the combined analysis of acoustic and perceptual data it was possible to highlight voice quality settings and elements of voice dynamics, which enabled the creation of a detailed profile of the HI children and users of CI. In relation to the vocal quality settings, the findings of high level of laryngeal hyperfunction, minimized range of lips, jaw, and tongue body, as well as retracted and lowered tongue body, combined with elements showing an elevation of habitual pitch, minimized pitch and loudness extension and variability, slow or fast rate and inadequate respiratory support. Such settings and movements were influenced and correlated to acoustic measures, especially those related to f0 and spectral slope. Conclusion: from the detailed description of prosodic elements it was possible to estimate the influence of some factors that may be related to the outcomes such as: presence/absence of CI and type of CI, followed by chronological age, from the moment of collection and finally the auditory age