LES CARTES SENSORIMOTRICES DE LA PAROLE : Corrélats neurocognitifs et couplage fonctionnel des systèmes de perception et de production des voyelles du Français --- La parole est construite sur un jeu de correspondances entre représentations sensorielles et articulatoires, notamment lors de l'acquisition du langage les premières années de vie. Par l'utilisation de l'imagerie par résonance magnétique fonctionelle, l'objectif premier de nos travaux était de déterminer, chez l'adulte, un possible couplage fonctionnel des systèmes de perception et de production des voyelles du Français, considérées comme unités élémentaires de la parole. En parallèle, nos travaux devaient permettre de clarifier les structures cérébrales liées au contrôle moteur orofacial de mouvements simples supralaryngés et, à l'aide de la technique de stimulation magnétique transcrânienne, de déterminer une possible implication causale des régions sensorielles et motrices lors de la perception de la parole. Nos travaux ont permis de souligner l'implication des régions sensorielles et motrices aussi bien lors de la réalisation des gestes orofaciaux que lors de la production et de la perception des voyelles. La mise en évidence d'un effet d'adaptation pour ces régions motrices, auditives et somatosensorielles lors de l'écoute ou de la réalisation répétée d'une même voyelle ou d'un même geste suggère de plus l'existence de boucles sensorimotrices communes, impliquées dans des mécanismes adaptatifs de contrôle en ligne des gestes de parole perçus et produits. Enfin, nous avons pu démontrer le rôle causal et fonctionnel des régions sensorielles et motrices de la voie dorsale lors de la catégorisation de sons de parole. Pris ensemble, nos travaux soulignent la nature distribuée sensorimotrice des représentations cérébrales des unités de parole. Mots clés: perception et production de la parole, voyelles, contrôle moteur orofacial, interactions sensorimotrices, représentations et cartes neurocognitives, IRMf, TMS. / SENSORIMOTOR MAPS OF SPEECH: Neurocognitive correlates and functional coupling of French vowel perception and production systems --- Speech is built on a set of correspondences between sensory and articulatory representations, especially during the acquisition of language in the early years of life. Using functional magnetic resonance imaging, the primary goal of our work was to determine, in adults, a possible functional coupling of French vowel perception and production systems, as elementary speech units. In parallel, our work should help clarify the brain structures related to the orofacial motor control of simple supralaryngeal movements and to determine a possible causal contribution of sensory and motor regions during speech perception. Our work highlights the involvement of sensory and motor areas when performing orofacial gestures and during vowel production and perception. Adaptive effects of these motor, auditory and somatosensory regions during repeated orofacial movements and in vowel perception and production suggest the existence of common adaptive mechanisms involved in the online control of perceived and produced speech gestures. Finally, we demonstrated a causal and functional role of the sensorimotor regions of the dorsal pathway in speech categorization. Taken together, our results emphasize the distributed sensorimotor nature of cerebral representations of speech units. Key words: speech perception and production, vowels, orofacial motor control, sensorimotor interactions, neurocognitive representations and maps, fMRI, TMS.

Made available in DSpace on 2016-04-27T18:12:28Z (GMT). No. of bitstreams: 1 Aline Neves Pessoa.pdf: 4984178 bytes, checksum: d99c1ef907dc4b911ae372a955638bc2 (MD5) Previous issue date: 2008-02-22 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / Introduction: Very few studies discuss speech development in hearing impaired children in the first years of life due to methodological difficulties and the number of variables involved. Acoustic inspection of articulatory adjustments and attempts to imitate a model made by the infant in different contexts can be a method to comprehend the manner in which first oral motor skills occur. The understanding of this process can provide strategies concerning intervention programs for infants in stages when motor gestures of speech are being acquired. The objective of this longitudinal study was to describe samples of speech production from a hearing impaired child, extracted from interactive situations in auditory rehabilitation, seeking to discuss phonetic development in different therapeutic contexts. The study also sets out to characterize and reflect upon the effects of therapist mediation in situations of longitudinal and transversal samples, particularly situations of spontaneous production and in immediate repetition facilitated by auditory feedback. Method: A case study design was used. The subject was 2y 11mo in the beginning of the study, and 3y 6mo at the last recording. I is a girl, with severe progressive bilateral sensory neural hearing loss with descending audiometric configuration. She had been using hearing aids since six months of age, and FM system since 3y 1mo of age. The effect of the use of FM system was also analyzed. Audio recordings of the child s therapy session were obtained and samples were selected based on auditory perception. These fragments were analyzed using a qualitative acoustic inspection. The PRAAT 4.0 software used for speech synthesis and analysis was utilized for acoustic inspection. Results and discussion: The data allows for discussion of the child s possibilities regarding adjustments of vocal source and filters in relation to her auditory feed back possibilities. Segmental and supra-segmental aspects were studied, as was modulation, tonal spectrum, fundamental frequency, and formants. The processes of substitution, omission, distortion, and odd solutions for articulatory adjustments, such as sudden vocal attack and nasalization, or systematic substitution of fricative for plosive phonemes were evident, especially spontaneous speech. Therapeutic strategies aimed at the multiplication of the possibilities of auditory feedback moments in which the child had greater possibility for adjustment in the form of its vocabulary we noticed that the articulators and source began to adjust in the direction of the target, and the articulatory gesture became more consistent. Also, after using the FM system in addition to hearing aids for five months, fricative phonemes, flaps, and other consonants that were previously less audible in the child s daily life became more frequent since she was able to perceive the form and meaning of speech in a more stable and accessible manner. Conclusions: Clinical strategies based on the need to more audibility aiming at speech development occur in the context of dialogues with the therapist. Multiple opportunities for auditory feedback are directed towards oral motor abilities in the acquisition of different phonemes. Therefore, acoustic inspection allowed for the establishment of relationship with auditory perception, enhancing the understanding of phonetic and phonological features, as well as symbolic and discursive aspects of oral language. Implications of the findings for clinical management are discussed. Acoustic inspection and its relation to auditory feed back seems to be a powerful method for understanding on the phonetic development in young children contributing to the development of therapeutic strategies / Introdução: Poucos estudos discutem a fase inicial do desenvolvimento de fala em sujeitos deficientes auditivos devido às dificuldades metodológicas e ao número de variáveis envolvidas. A inspeção acústica diante dos ajustes realizados na produção de fala em diferentes contextos propiciados pelo enquadre terapêutico pode ser uma possibilidade para compreendermos as primeiras hipóteses acerca das habilidades motoras de fala, a partir das condições sensoriais auditivas. A compreensão deste processo traz conhecimento acerca do desenvolvimento de linguagem de deficientes auditivos, repercutindo nas formulações de estratégias de intervenção/tratamento nessas crianças. Objetivo: Descrever amostras de produção de fala em uma criança com deficiência auditiva; caracterizar e refletir sobre a produção de fala em situações do enquadre terapêutico visando discutir os ajustes fonoarticulatórios na produção de fala dos sons do português brasileiro (PB), através da interpretação dos dados acústicos em relação à audição residual. Material e método: Trata-se de um estudo de caso, sendo o sujeito do sexo feminino, no início da pesquisa com 2a11m, e no término, com 3a6m de idade, portador de deficiência auditiva neurossensorial progressiva de grau profundo bilateral. A criança usava aparelhos de amplificação sonora individual (AASIs) desde 6 meses de idade e Sistema de Freqüência Modulada (Sistema FM) desde 3a1m de idade. Gravações de áudio da produção de fala em sessão terapêutica de abordagem verbaloral e os recortes transversais e longitudinais de sons de fala em diferentes contextos permitiram a inspeção acústica (através do software Praat v 4.0). Resultados e Discussão: Os dados trouxeram discussões acerca das hipóteses e dos ajustes de fonte e filtro realizados pela criança a partir da sua condição de utilização da audição residual. Aspectos segmentais, supra-segmentais e de qualidade vocal puderam ser estudados, tais como modulação, gama tonal, freqüência fundamental e formantes. Processos de ajustes, caracterizados também por substituições, omissões e distorções, e recursos, como o de golpe de glote e nasalização, dentre mudanças sistemáticas no modo de produção de consoantes (plosão no lugar de fricção) caracterizaram algumas das produções de fala da criança nos primeiros momentos da análise; as instabilidades e imprecisões articulatórias foram mais acentuadas nos momentos de emissão espontânea do que nos momentos por repetição imediata. A partir das estratégias terapêuticas, compostas por multiplicação de possibilidades de feedback auditivo, notou-se que os articuladores e fonte começaram a se ajustar mais precisamente em direção ao alvo, e assim, o gesto articulatório se mostrava menos frágil. O Sistema FM acoplado aos AASIs também ofereceu melhores condições de multiplicação de evidências sensoriais para a percepção auditiva; no decorrer dos meses, percebemos que as hipóteses e ajustes para formar engramas dos fones fricativos, laterais flapes, dentre outros começaram a se constituir no repertório lingüístico, definindo uma nova condição de a criança perceber a forma e o significado da língua de maneira lúdica, estável e acessível. Considerações Finais: O manejo clínico do fonoaudiólogo traz especificidades nas estratégias terapêuticas e oferece maiores e melhores oportunidades de a criança com deficiência auditiva construir suas hipóteses acerca da construção na/da linguagem no processo de aquisição dos sons do PB. Isso se dá, principalmente, a partir de múltiplas oportunidades de feedback auditivo e, portanto, acesso e oportunidades de experiências para a formação de engramas motores de fala. Por isso, consideramos que lançarmos mão da inspeção acústica, relacionando esses dados com a percepção auditiva, nos dá subsídio para um possível entendimento das características fonéticas/fonológicas (além das discursivas e simbólicas) da fala de um sujeito e das possibilidades de percepção e produção de fala, sendo que esses processos implicam em manejos no enquadre terapêutico

Les salles de classe sont des milieux bruyants auditivement et visuellement. Au Québec, le bruit auditif dans les écoles s’avère une problématique qui règne depuis des dizaines d’années et qui reste encore d’actualité aujourd’hui. Le bruit environnant peut impacter négativement le bien-être et les apprentissages des élèves et le bien-être des enseignant·es. D’autant plus, souvent, la source principale de bruit dans les écoles provient de la parole, un comportement qui peut être contrôlé. Les élèves et surtout les enseignant·es surchargent leur système vocal pour pouvoir faire passer leur message oral à travers le bruit auditif, augmentant leur niveau d’effort vocal. Dans les salles de classe, les distractions visuelles telles que les affiches murales contribuent à l’encombrement visuel, qui peut être considéré comme du « bruit visuel ». Celui-ci peut également impacter négativement le bien-être des élèves et leurs apprentissages. Considérant la nature multimodale, ou audiovisuelle, de la parole, nous nous questionnions sur l’influence de l’encombrement visuel sur la parole. Ce mémoire de maîtrise, composé de deux études, avait pour but de 1) étudier la perception subjective des élèves québécois de leur salle de classe en relation avec des données acoustiques objectives, et 2) étudier l’effet de l’encombrement visuel sur l’effort vocal en termes de paramètres acoustiques (SPL, f0 et CPP) et de perception auto-rapportée de locutrices. Les deux études se sont basées sur des méthodes mixtes, intégrant des méthodes quantitatives similaires (ex. : collecte de mesures objectives acoustiques, analyses acoustiques) et des méthodes qualitatives similaires (ex. : collecte de données subjectives perceptuelles, analyse inductive de questions ouvertes). Les analyses quantitatives et qualitatives des deux études révèlent que bien que les résultats relatifs aux données objectives (mesures acoustiques) n’étaient pas statistiquement significatifs, les résultats relatifs aux données subjectives (perception) l’étaient. Par exemple, dans la première étude, les niveaux d’appréciation du son des élèves (EAE) n’étaient pas tous corrélés avec les SPLs, et dans la deuxième étude, le niveau d’encombrement visuel n’était pas corrélé aux paramètres acoustiques de SPL, f0 et CPP. Ces résultats mettent en lumière l’importance de considérer et d’inclure des données subjectives et perceptuelles dans les études portant sur les paysages sonores éducatifs et sur l’effort vocal, car ce sont des expériences vécues par des humains. / Classrooms are acoustically and visually noisy environments. In Quebec, auditory noise in schools is a problem that has existed for decades and is still relevant today. Background noise can negatively impact the well-being and learning of students and the well-being of teachers. Moreover, the main source of noise in schools comes from speech, a behavior that can be controlled. Students and especially teachers put pressure on their vocal system to be able to convey their oral message through auditory noise, increasing their level of vocal effort. In classrooms, visual distractions such as wall posters can be considered as visual clutter, or visual noise, an element that can also negatively impact students’ well-being and learning. Considering the multimodal, or audiovisual, nature of speech, we question the influence of visual clutter on speech. This master's thesis, composed of two studies, aimed to 1) study the subjective perception of Quebec students of their classroom in relation to objective acoustic data, and 2) study the effect of visual clutter on vocal effort in terms of acoustic parameters (SPL, f0 and CPP) and self-reported perception of female speakers. Both studies were based on mixed methods, integrating similar quantitative methods (e.g., collection of objective acoustic measurements, acoustic analyses) and similar qualitative methods (e.g., collection of subjective perceptual data, inductive analysis of open-ended questions). Quantitative and qualitative analyses of the two studies reveal that although the results relating to the objective data (acoustic measurements) were not statistically significant, the results relating to the subjective data (perception) were. For example, in the first study, students' Evaluation of the Acoustic Environment (EAE) were not all correlated with measured SPLs, and in the second study, the level of visual clutter was not correlated with acoustic parameters of SPL, f0 and CPP. These findings highlight the importance of considering and including subjective and perceptual data in studies of educational soundscapes and vocal effort, as the human experience is subjective.