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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

An Auditory-Perceptual Intervention Program for Fricatives: Effects and Implications for Toddlers without Fricatives

Bandaranayake, Dakshika W. 27 September 2012 (has links)
No description available.
12

Etude aéroacoustique d'un canal avec obstacle(s) - Application à la production de fricatives / Aeroacoustic study of a duct with obstacle(s) - Application to fricative production

Fujiso, Yo 14 February 2014 (has links)
L'air que nous respirons au travers des voies aériennes supérieures est essentiel pour la vie et pour la communication orale. Dans les études de production de parole humaine, l'écoulement d'air est en général extrêmement simplifié. Or cet écoulement est complexe car turbulent et fortement sensible aux conditions limites. Dans le cas de la production de fricatives non voisées, une description plus fine de l'écoulement s'avère nécessaire pour pouvoir modéliser correctement les mécanismes aéroacoustiques sous-jacents. A l'aide d'expériences in-vitro et de simulations numériques, l'objectif de cette thèse est de contribuer à la modélisation et la caractérisation aéroacoustique d'écoulements dans des configurations de type canal avec obstacle(s), avec application à la production de fricatives non voisées. Une attention toute particulière est portée à l'influence des conditions limites et à la turbulence. / Airflow through the human upper airways is essential for life and for oral communication. In studies dealing with human speech production, airflow is mostly severely simplified. Nevertheless, this airflow is complex owing to turbulence and extreme sensitivity to boundary conditions. Recently, deeper attention has been given to characterize the airflow in the case of unvoiced fricative production and the necessity of obtaining a more detailed flow description has been outlined. With the aid of in-vitro experiments and numerical simulations, the aim of the current PhD research is to contribute to the aeroacoustic modeling and characterization of airflows through various configurations of ducts with obstacle(s), relevant for unvoiced fricative speech production. Special interest is given to the influence of boundary conditions and to turbulence.
13

Etude acoustique des fricatives de l'arabe standard (locuteurs algériens) / Acoustic study of fricatives in standard Arabie (Algerian speakers)

Benamrane, Amel 17 December 2013 (has links)
Cette étude porte sur l'arabe standard parlé par des locuteurs algériens (trois femmes et trois hommes). Notre objectif était d'apporter des précisions quant au système consonantique de cette langue, en particulier les fricatives. Ce système est riche en lieux d'articulation: labiodental,interdental, alvéolaire, postalvéolaire, uvulaire, pharyngal et laryngale. Il est également caractérisé par le phénomène de la pharyngalisation lié à deux paires de fricatives, les interdentales et les alvéolaires. A travers cette étude à visée acoustique, nous nous sommes focalisée sur les propriétés relatives au bruit de friction des fricatives, en calculant son centre de gravité (CoG). Nous nous sommes intéressée également aux caractéristiques des quatre premiers formants des voyelles [a]brève et [a:] longue à proximité des fricatives, dans les séquences d'ordre CV. Puis, nous avons étudié la durée segmentale absolue et relative, l'intensité relative et l'harmonicité (HNR) des quatorze fricatives de cette langue, en ciblant leur lieu d'articulation, et le trait phonologique de leur voisement. Enfin, nous avons relevé les particularités phonétiques des lieux postérieurs, uvulaire, pharyngal et laryngal qui se sont révélés intéressants en tant qu'indices phonétiques discriminants. / This acoustic study focuses on standard Arabic, spoken by Algerian subjects (three female and three male subjects). The main thrust of the investigations is to provide clarification on the consonantal system of the language, and more particularly on the acoustic properties of its fricatives. This system is rich in places of articulation: labiodental, interdental, alveolar, postalveolair, uvular, pharyngeal and laryngeal. It is also characterized by the phenomenon of pharyngalisation, appearing in two pairs of fricatives: the interdental and alveolar fricatives. Based on our acoustic study, we have observed the properties relating to the frication noise of fricatives by calculating their center of gravity (CoG). We have also discussed the characteristics of the first four formants of the back vowels, short [a] and long [a:], in the vicinity of the fricatives, in CV sequences. Then, we have study absolute and relative segmental durations, relative intensity and harmonicity (HNR) of the fourteen fricatives of our study. This analyse was carried out to target their place of articulation and the phonological voicing contrast. Finally, we have tried to address the features of posterior locations, uvular, pharyngeal and laryngeal, which proved to be relevant as contrastive phonetic cues
14

Etude articulatoire et acoustique des fricatives sibilantes / Articulatory and acoustic study of sibilant fricatives

Toda, Martine 13 June 2009 (has links)
L’objectif de cette thèse est de décrire de manière analytique le spectre du bruit de friction en mettant en évidence l’affiliation des pics spectraux aux cavités du conduit vocal, par le biais de la modélisation acoustique et avec l’aide des données IRM de 7 langues [30 locuteurs]. Les résultats sont les suivants : 1. La dispersion des sibilantes dans l’espace articulatoire dépend du système phonologique [contrastes [+/- antérieur], [+/- distribué], ou les deux]. En français [+/- antérieur], 7 locuteurs], la variation inter-individuelle est importante. 2. Cette variation est due à deux variantes articulatoires du /ʃ/ : (a) plutôt apical, comportant une cavité sublinguale, accompagné de protrusion labiale, et semblable au /ʂ/ polonais ; et [b] palatalisé, mettant en œuvre le bombement du dos de la langue, comparable au /ɕ/ polonais. L’équivalence acoustique des deux variantes est démontrée par une simulation acoustique systématique. 3. En polonais, où la différence articulatoire est phonémique, /ʂ/ est caractérisé par un pic ultra-bas [1,5-1,8 kHz], affilié à la cavité antérieure, d’après la simulation acoustique à l’aide de fonction d’aire réelles de deux locuteurs. 4. Les données articulatoires présentent systématiquement une constriction dentale étroite. D’après la modélisation acoustique, la protrusion labiale aurait comme effet d’abaisser la fréquence d’un formant affilié spécifiquement à la cavité labiale. En somme, la présence de deux constrictions étroites linguale et dentale rend possible le contrôle quasi indépendant d’au moins deux résonances. Cette spécificité garantit aux sibilantes un bruit distinctif qui permet d’expliquer la richesse de leurs inventaires / The aim of this study is to analytically describe the frication noise spectrum in terms of formant affiliation to vocal tract cavities. The high-resolution, teeth-inserted MRI data of sibilants in 7 languages [30 subjects in total] as well as 1D and 3D acoustic modeling are involved. The results are summarized as follows: 1. Sibilants’ dispersion within the articulatory space depends on the language’s phonemic inventory [with contrasts involving [+/- anterior], [+/- distributed], or both features]. A large amount of inter-speaker variation [7 subjects] is observed in French /s/ and /ʃ/ contrasted by [+/- anterior]]. 2. This variation is due to two articulatory variants of the French /ʃ/ : [a] apical, with a sublingual cavity, and protruded lips, like Polish /ʂ/ ; [b] palatalized, with a domed tongue dorsum, like Polish /ɕ/. Systematic acoustic modeling provides evidences about their acoustic equivalence. 3. In Polish, where /ʂ/ and /ɕ/ are contrastive, a super-low peak [1.5 – 1.8 kHz] characterizes the former. The acoustic modeling results using realistic area functions of two subjects show that this peak is affiliated to the front oral cavity. 4. The articulatory data show a systematic narrow constriction at the teeth in all of the examined sibilants. Acoustic modeling shows that lip protrusion results in lowering the formant affiliated specifically to the lip cavity. To conclude, the narrow tongue and teeth constrictions in sibilants allow the speaker to control quasi independently
15

Prosodically driven phonetic properties in the production and perception of spoken Korean

Jang, Mi 05 November 2009 (has links)
The focus of this study was to explore how prosodic position and word type affect the phonetic structure and resulting perceptual identification of Korean stops and fricatives. When there is less contextual information, speakers tend to produce clearer speech. For example, consonants at the beginning of prosodic domains, such as syllables, words or phrases, are known to be more clearly articulated and distinguishable than later-occurring consonants. However, it is not yet clear whether the prosodically conditioned realizations of a segment are perceptually distinctive in continuous speech. In addition, there are few studies examining whether the properties of prosodic domain-initial segments are affected by the information content of words (real vs. nonsense words). The acoustic properties of stops and fricatives were compared across IP, PP and Wd-initial positions both in real and nonsense words. It was found that segments in the higher prosodic domain-initial positions showed enhanced durational properties compared to the lower prosodic domain-initial positions. However, the enhancing strategies were different among phonation types. Relative to lenis and aspirated stops, and lenis fricatives, tense stops and fricatives showed less consistent variation as a function of prosodic position and word type. In the perception study, the identification error rates and reaction time for same-spliced CVs were compared to those for cross-spliced CVs. Korean listeners identified the same-spliced CVs more accurately and faster than cross-spliced CVs. In addition, the distinctive acoustic properties of each prosodic domain-initial position were perceptually distinguished by Korean listeners. Due to relatively shorter duration and less distinctive contrast, the target CVs extracted from lower prosodic domain-initial positions caused more confusion in the identification of target segments. In conclusion, this study provides the evidence that speakers modulate their speech clarity depending on information content. By enhancing phonetic properties and phonological contrast, speakers tend to provide perceptual cues for prosodic positions with less contextual information. / text
16

Aquisição da regra de assimilação de vozeamento em Português Brasileiro / The acquisition of the phonological process of voicing in Brazilian Portuguese

Silva, Cristiane Conceição 26 March 2008 (has links)
O objetivo deste trabalho é analisar a aquisição do processo fonológico de vozeamento em português brasileiro. Para isso, foram analisados tanto dados naturalísticos de uma criança acompanhada longitudinalmente de 1;4 anos até 4;0 anos, quanto dados experimentais/latitudinais de 46 crianças de 2;0 anos até 4;1 anos. Foi investigada a aquisição de /s,z/ na posição de onset (estudo naturalístico) e também a aquisição de [s,z] nas posições de coda medial e final em ambos os estudos. Verificamos que o período de aquisição dos segmentos na coda foram tardios, se comparados com os períodos encontrados na literatura (Mezzomo, 2003). Por isso, analisamos, também, a aquisição desses segmentos de acordo com o contexto seguinte: pausa, surdo e sonoro. Observamos que o contexto sonoro foi o mais difícil para as crianças, já que a aquisição ocorreu por volta de 4;0 anos. Além disso, analisamos as estratégias utilizadas pelas crianças durante o processo de aquisição e encontramos um padrão relacionado à produção inicial do segmento [s] mesmo em contextos em que a produção deveria ser sonora. Foi feita uma comparação dos resultados obtidos no contexto sonoro dos dois estudos (naturalístico e experimental) com o trabalho de Newton & Wells (2002) que analisa os processos de assimilação, elisão e liaision e constatamos, a partir da análise das ocorrências de vozeamento correto, pausa e outras realizações que o processo de vozeamento não surge assim que a criança começa a produzir sentenças com duas palavras e não está adquirido até os 4;0 anos (última faixa etária analisada). A partir desses resultados, concluímos que o processo de vozeamento é uma regra fonológica a ser adquirida e não um fenômeno apenas fonético (como mostraram os autores). Dado que o processo de vozeamento é uma regra fonológica, concluímos que a análise lingüística, feita a respeito do processo de vozeamento na fala do adulto, está correta ao assumir que a forma subjacente para a regra de vozeamento é o [s], pois também nos dados infantis percebemos uma tendência das crianças em produzir fricativas surdas e evitar a produção de fricativas sonoras. / This research aimed at analyzing the acquisition of the phonological process of voicing in Brazilian Portuguese. To do so, naturalistic data, longitudinally collected from a child since she was 1;4 until she became 4;0, as well as experimental data, latitudinally collected from 46 children from the age 2;0 to the age 4;1, were analyzed. In addition, the acquisition of /s z/ in onset position and in medial and final coda position were investigated in both studies. We observed that the period of segment acquisition was later in comparison to the ones mentioned in the literature ( Mezzomo, 2003). Therefore we also analyzed the acquisition of /s z/, taking into account the following context, that is to say, what there is after them: a pause, a voiceless or a voiced segment. We noticed that the most difficult context for children was the one that contained a voiced segment, since the acquisition of /z/ in coda position occurred only at the age of 4;0. Besides, we analyzed the strategies used by children during the acquisition period of the voicing process and, as a result, we found a pattern in relation to the initial productions: children start producing [s] even when [z] is expected to be produced. We also compared the results that we obtained through the investigation of voiced contexts in both the naturalistic and the experimental studies to Newton and Wells (2002)\'s work, in which the processes of assimilation, elision and liaision are analyzed. Differently from their results, our research showed that the voicing process does not occur as soon as children start producing sentences with two words, since it is not still acquired until the age of 4;0 (the last period analyzed). Based on these results, we concluded that the voicing process is a phonological rule that must be learnt by children and, consequently, it is not a mere phonetic phenomenon, as pointed by the authors. Also based on our results, we concluded that the linguistic analysis done for the adult speech is right when it assumes that [s] the underlying form to which the voicing rule is applied, since we noticed a tendency for children to produce the voiceless fricative [s] and avoid its voiced counterpart [z].
17

Realization of Fricatives in Patients with Parkinson’s Disease Treated with Deep Brain Stimulation in the Subthalamic Nucleus or the Caudal Zona Incerta

Eklund, Elisabeth, Sandström, Lena January 2013 (has links)
Background In advanced Parkinson’s disease (PD) the motor symptoms can be treated with deep brain stimulation (DBS). Subthalamic nucleus (STN) has been the most common target and caudal zona incerta (cZi) is a more recent target for stimulation. Stimulation in both of these targets has proved to be positive for the motor symptoms but there is no consensus about how DBS affects the speech and the articulation. Aim The aim of this study was to investigate how fricatives are realized within patients suffering from PD treated with DBS in STN or cZi. Method 9 patients stimulated in STN and 10 patients stimulated in cZi were recorded reading a shorter text.  The recordings were made preoperatively (Pre) and 12 months after surgery with the stimulation switched off (sOff) and on (sOn). From the recordings the fricatives were extracted and assessed in a blinded and randomized procedure. Results For the patients stimulated in cZi the target fricative /s/ had significant lower correct realizations in the sOn condition compared to the other two conditions. The other target fricatives in cZi showed the same pattern as well. For the STN group no unequivocal pattern could be seen. Conclusions The results suggest that stimulation in cZi may affect the patients’ articulation of fricatives and thereby their extended articulatory movements more negative than stimulation in STN.
18

Estudo das fricativas coronais da língua portuguesa : da fonética à ortografia e da ortografia à fonética /

Ribeiro, Luciana Mercês. January 2011 (has links)
Orientador: Luiz Carlos Cagliari / Banca: Maria Mercedes Saraiva Hackerott / Banca: Rosane de Andrade Berlinck / Resumo: Este trabalho buscou estudar as fricativas coronais da língua portuguesa e sua relação com a ortografia. Procurou ainda depreender o que essa relação pode dizer sobre a constituição e funcionamento da ortografia da língua portuguesa, e, por outro lado, apresentou e discutiu aspectos do desenvolvimento histórico desses sons. O estudo envolveu historicamente fricativas coronais e palatais como [s], [ ], [z], [ ] [ ], [ ], [S], entre outras realizações históricas. Na escrita, os grafemas <s>, <z>, <ss>, <c>, <ç>, <sc>, <xc> representam fricativas coronais e os grafemas <x>, <ch> representam fricativas palatais. A pesquisa investigou a proveniência desses sons fricativos no português e como eles têm sido descritos, representados e estudados nas gramáticas, ortografias, tratados de ortografia e trabalhos mais antigos (do século XV até XX). Verificou ainda determinadas considerações de dialetólogos, filólogos e demais pesquisadores da língua portuguesa sobre o assunto em questão. A perspectiva teórica aqui adotada partiu da obra Aspectos Teóricos Linguísticos da Ortografia (2004) de Luiz Carlos Cagliari, que traz discussões fundamentais sobre ortografia e a relação entre a oralidade e a sua representação gráfica. Esta obra representa ainda um novo olhar sobre os estudos metaortográficos da língua portuguesa. A presente pesquisa trouxe um conjunto de gravações feitas em 2008 e 2010 com falantes portugueses da Região de Entre Douro e Minho e da Região Trás-os-Montes e do Alto Douro para comparar tais realizações com as análises históricas. Esse material testemunha pronúncias conservadoras que foram descritas nos primeiros trabalhos normativos em língua portuguesa por terem ajudado a interferir na sistematização da ortografia. As gravações foram analisadas por meio do programa PRAAT para investigação acústica. A partir do presente estudo... (Resumo completo, clicar acesso eletrônico abaixo) / Résumé: Ce travail a cherché étudier les fricatives coronales de la langue portugaise et sa relation avec l'orthographe. Il y a eu encore l'intérêt de déduire ce que cette relation peut dire à propos de la constitution et du fonctionnement de l'orthographe portugaise et, en outre, de présenter et discuter des aspects du développement historique de cette catégorie de sons. L'étude a compris historiquement les consonnes fricatives coronales et palataux comme [s], [ ], [z], [ ] [ ], [ ], [S], entre autres réalisations historiques. À l'écrit, les graphèmes <s>, <z>, <ss>, <c>, <ç>, <sc>, <xc> représentent les fricatives coronales et les graphèmes <x> et <ch>, les palataux. Cette recherche a étudié l'origine des sons fricatives dans le portugais et comment ils ont été décrit, représentés et évalués dans les grammaires, dans les orthographes, dans les traités de l'orthographe ainsi que dans les travaux plus anciens (du XVème et XVIème siècles). Nous avons vérifié aussi quelques considérations de dialectologues, philologues et d'autre investigateurs de la langue portugaise sur le sujet en question. La perspective théorique ici adoptée s'est basée sur l'oeuvre Aspectos Teóricos Linguísticos da Ortografia (2004), de Luiz Carlos Cagliari, qui comprend des discussions fondamentaux sur l'orthographe et la relation entre l'oralité et sa représentation graphique, elle représente encore un nouveau regard sur les études « métaortographiques » de la langue portugaise. Cette recherche a apporté un ensemble d'enregistrements réalisées en 2008 et 2010 avec des portugais des régions d'Entre Douro e Minho, Trás-os-Montes et Alto Douro pour comparer ces réalisations phonétiques avec les analyses historiques. Ce matériel est témoin des prononciations conservatrices qui ont été décrites dans les premiers travaux normatifs dans la langue... (Résumé complet accès életronique ci-dessous) / Mestre
19

Estudo das fricativas coronais da língua portuguesa: da fonética à ortografia e da ortografia à fonética

Ribeiro, Luciana Mercês [UNESP] 16 May 2011 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:26:51Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-05-16Bitstream added on 2014-06-13T19:55:14Z : No. of bitstreams: 1 ribeiro_lm_me_arafcl.pdf: 3265050 bytes, checksum: e921a246d40a619c6c4b33df59033902 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Ce travail a cherché étudier les fricatives coronales de la langue portugaise et sa relation avec l’orthographe. Il y a eu encore l’intérêt de déduire ce que cette relation peut dire à propos de la constitution et du fonctionnement de l’orthographe portugaise et, en outre, de présenter et discuter des aspects du développement historique de cette catégorie de sons. L’étude a compris historiquement les consonnes fricatives coronales et palataux comme [s], [ ], [z], [ ] [ ], [ ], [S], entre autres réalisations historiques. À l’écrit, les graphèmes <s>, <z>, <ss>, <c>, <ç>, <sc>, <xc> représentent les fricatives coronales et les graphèmes <x> et <ch>, les palataux. Cette recherche a étudié l’origine des sons fricatives dans le portugais et comment ils ont été décrit, représentés et évalués dans les grammaires, dans les orthographes, dans les traités de l’orthographe ainsi que dans les travaux plus anciens (du XVème et XVIème siècles). Nous avons vérifié aussi quelques considérations de dialectologues, philologues et d’autre investigateurs de la langue portugaise sur le sujet en question. La perspective théorique ici adoptée s’est basée sur l’oeuvre Aspectos Teóricos Linguísticos da Ortografia (2004), de Luiz Carlos Cagliari, qui comprend des discussions fondamentaux sur l’orthographe et la relation entre l’oralité et sa représentation graphique, elle représente encore un nouveau regard sur les études « métaortographiques » de la langue portugaise. Cette recherche a apporté un ensemble d’enregistrements réalisées en 2008 et 2010 avec des portugais des régions d’Entre Douro e Minho, Trás-os-Montes et Alto Douro pour comparer ces réalisations phonétiques avec les analyses historiques. Ce matériel est témoin des prononciations conservatrices qui ont été décrites dans les premiers travaux normatifs dans la langue... (Résumé complet accès életronique ci-dessous) / Este trabalho buscou estudar as fricativas coronais da língua portuguesa e sua relação com a ortografia. Procurou ainda depreender o que essa relação pode dizer sobre a constituição e funcionamento da ortografia da língua portuguesa, e, por outro lado, apresentou e discutiu aspectos do desenvolvimento histórico desses sons. O estudo envolveu historicamente fricativas coronais e palatais como [s], [ ], [z], [ ] [ ], [ ], [S], entre outras realizações históricas. Na escrita, os grafemas <s>, <z>, <ss>, <c>, <ç>, <sc>, <xc> representam fricativas coronais e os grafemas <x>, <ch> representam fricativas palatais. A pesquisa investigou a proveniência desses sons fricativos no português e como eles têm sido descritos, representados e estudados nas gramáticas, ortografias, tratados de ortografia e trabalhos mais antigos (do século XV até XX). Verificou ainda determinadas considerações de dialetólogos, filólogos e demais pesquisadores da língua portuguesa sobre o assunto em questão. A perspectiva teórica aqui adotada partiu da obra Aspectos Teóricos Linguísticos da Ortografia (2004) de Luiz Carlos Cagliari, que traz discussões fundamentais sobre ortografia e a relação entre a oralidade e a sua representação gráfica. Esta obra representa ainda um novo olhar sobre os estudos metaortográficos da língua portuguesa. A presente pesquisa trouxe um conjunto de gravações feitas em 2008 e 2010 com falantes portugueses da Região de Entre Douro e Minho e da Região Trás-os-Montes e do Alto Douro para comparar tais realizações com as análises históricas. Esse material testemunha pronúncias conservadoras que foram descritas nos primeiros trabalhos normativos em língua portuguesa por terem ajudado a interferir na sistematização da ortografia. As gravações foram analisadas por meio do programa PRAAT para investigação acústica. A partir do presente estudo...
20

Julgamento perceptivo-auditivo e perceptivo-visual das produções gradientes de fricativas coronais surdas / Perceptual-auditory and perceptual-visual judgment of the productions gradients of deaf coronal fricatives

Lima, Fernanda Leitão de Castro Nunes de [UNESP] 22 May 2018 (has links)
Submitted by FERNANDA LEITAO DE CASTRO NUNES DE LIMA (fernandaleitao@live.com) on 2018-06-19T04:27:15Z No. of bitstreams: 1 Dissertação Final.pdf: 1310670 bytes, checksum: ab7f761d3d1be439f987de5d800203cd (MD5) / Approved for entry into archive by Satie Tagara (satie@marilia.unesp.br) on 2018-06-19T14:10:24Z (GMT) No. of bitstreams: 1 lima_flcn_me_mar.pdf: 1310670 bytes, checksum: ab7f761d3d1be439f987de5d800203cd (MD5) / Made available in DSpace on 2018-06-19T14:10:24Z (GMT). No. of bitstreams: 1 lima_flcn_me_mar.pdf: 1310670 bytes, checksum: ab7f761d3d1be439f987de5d800203cd (MD5) Previous issue date: 2018-05-22 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Objetivo: O objetivo do presente estudo foi analisar a porcentagem de respostas dos juízes no julgamento perceptivo-auditivo dos áudios e no julgamento perceptivo-visual de imagens ultrassonográficas na detecção de produções gradientes das fricativas coronais surdas. Ainda, verificar se há diferenças entre essas formas de julgamento e se elas se correlacionam. Métodos: Foram selecionados 20 juízes com conhecimento sobre o processo de produção da fala, além da classificação e descrição fonética dos diferentes fonemas do Português Brasileiro (PB). Os estímulos julgados foram coletados de um banco de dados, arquivos de áudio e vídeo (imagens ultrassonográficas) relativos à produção de palavras “sapo” e “chave”, de 11 crianças falantes do PB, na faixa etária de 6 a 12 anos de idade (9 meninos e 2 meninas), com produção de fala atípica. Foi realizada uma codificação prévia dos arquivos coletados. Após instrução prévia, os juízes deveriam escolher, imediatamente à apresentação de um estímulo, uma dentre três opções dispostas na tela do computador.O procedimento experimental consistiu no julgamento dos arquivos de áudio e julgamento das imagens ultrassonográficas, executado pelo software PERCEVAL.No julgamento dos arquivos de áudio as opções eram: produção correta, incorreta ou gradiente, enquanto no julgamento das imagens ultrassonográficasas opções eram: produção de [s], produção de [∫] ou produção indiferenciada.O tempo de apresentação, o modo aleatorizado de seleção dos estímulos e o tempo de reação foram controlados automaticamente pelo software PERCEVAL. Os dados foram submetidos à análise estatística. Resultados: O julgamento de imagens propiciou uma maior identificação dos estímulos gradientes (137 estímulos) e um menor tempo de reação na realização da tarefa (média=1073,12 ms) comparativamente ao julgamento perceptivo-auditivo (80 estímulos, tempo de reação médio=3126,26 ms), ambos estatisticamente significante (p<0,00). O teste de correlação de Spearman não mostrou significância estatística para porcentagem de respostas, nem para o tempo de reação. Conclusão: O uso das imagens ultrassonográficas no julgamento é o método mais sensível para a detecção da produção gradiente na produção de fala, podendo ser utilizado como método complementar do julgamento perceptivo-auditivo na análise de fala. / Purpose: The purpose of this study was to analyze the percentage of judges' answers in the auditory-perceptual judgment of the audios and in the visual-perceptual judgment of ultrasound images in the detection of gradient productions of the voiceless coronal fricatives. Also, to verify whether there are differences between these forms of judgment and whether they correlate. Methods: 20 judges with knowledge about the speech production process, besides the phonetic classification and description of the different Brazilian Portuguese (BP) phonemes were selected. The judged stimuli were collected from a database, audio and video files (ultrasound images) related to the production of "sapo”(frog) and "chave" (key) words, of 11 BP speakers children aged from 6 to 12 years old (9 boys and 2 girls), with atypical speech production. A previous encoding of the collected files was performed. After previous instruction, the judges should choose, immediately the presentation of a stimulus, one of three options arranged on the computer screen. The experimental procedure consisted in the judgment of the audio files and judgment of the ultrasound images, executed by the PERCEVAL software. In the judgment of the audio files the options were: correct, incorrect or gradient production, while in the judgment of the ultrasound images the options were: production of [s], production of [∫] or undifferentiated production. The presentation time, the randomized mode of selection of the stimuli and the reaction time were controlled automatically by PERCEVAL software. The data were submitted to statistical analysis. Results: The judgment of images provided a greater identification of the gradient stimuli (137 stimuli) and a shorter response time (mean = 1073.12 ms) compared to the auditory-perceptual judgment (80 stimuli, mean reaction time = 3126.26 ms), both statistically significant (p <0.00). Spearman's correlation test did not show statistical significance for percentage of responses, nor for reaction time. Conclusion: The use of ultrasound images in the judgment is the most sensitive method for the detection of gradient production in speech production, and can be used as a complementary method of auditory-perceptual judgment in the speech analysis.

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