O contraste entre oclusivas alveolares e velares em dados típicos de fala: análises acústica e ultrassonográfica

Melo, Roberta Michelon; Mota, Helena Bolli; Berti, Larissa Cristina

doi:10.1590/2317-1782/20172016117

Cited by 3 publications

(6 citation statements)

References 22 publications

(39 reference statements)

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“…The USG of tongue movements combined with dynamic speech production models, such as AP, have been a very interesting research tool for speech analysis, specifically for articulatory gestures of adults and children (18,19) . Especially in children, speech errors are presented as gradients, that is, often these errors are their attempts to speak correctly, and not just simple speech sounds substitutions or omissions (20) .…”

Section: Discussionmentioning

confidence: 99%

Movimentos de língua na produção do /l/ em crianças com e sem distúrbios dos sons da fala em diferentes faixas etárias

Barberena

Portalete

Moraes

et al. 2020

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RESUMO Objetivo: este estudo utilizou a ultrassonografia dos movimentos de língua e modelos dinâmicos de produção de fala para caracterizar os gestos articulatórios na produção do /l/ no Português Brasileiro (PB) em diferentes faixas etárias, comparando-os entre crianças típicas e atípicas. Método: a amostra foi constituída por 30 crianças típicas e 30 atípicas, com idades entre 4 e 8 anos, submetidas a avaliações fonoaudiológica e ultrassonográfica. A avaliação foi realizada mediante gravação da produção de palavras com o som /l/ nos contextos vocálicos de /a/, /i/ e /u/, com seis repetições de cada palavra. O software utilizado foi o Articulate Assistant Advanced (AAA). Para as análises quantitativas foram considerados: os 42 pontos que interceptaram as curvas de língua em cada imagem para descrição dos gestos articulatórios; o cálculo das linhas médias de cada curva e os intervalos de confiança entre os grupos; e o cálculo das diferenças entre as curvas médias dos contornos de língua de acordo com a faixa etária. Resultados: houve elevação de ponta de língua e retração de dorso e raiz na articulação do /l/. As crianças típicas, independentemente da idade, apresentaram maior refinamento dos gestos articulatórios de língua do que as atípicas. Nas crianças mais velhas, houve maior delimitação nos contornos médios de língua desde a ponta até a raiz. Conclusão: a ultrassonografia dos movimentos de língua é uma importante ferramenta para a caracterização dos gestos articulatórios do /l/, para diferenciação entre as produções típica e atípica deste som, e observação do desenvolvimento dos gestos articulatórios.

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Section: Discussionmentioning

confidence: 99%

Movimentos de língua na produção do /l/ em crianças com e sem distúrbios dos sons da fala em diferentes faixas etárias

Barberena

Portalete

Moraes

et al. 2020

CoDAS

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“…We included these dorsal articulations in our analyses if there were no correct velar stops. Given that multiple repetitions were available, and Melo et al (2017) had shown the AAA t test to be a useful measure of differentiating /t/ and /k/, we used multiple repetitions of alveolars and dorsal articulations in Study 2. We handsearched each session for data that could be used to define a dorsal crescent against an alveolar baseline using the following criteria, bearing in mind that, unlike TD children, there would not always be simple [k] for /k/ and [t] for /t/ in the sample: (a) There were at least three (and up to 10) impressionistically correct or near attempts at the dorsal consonant in an open vowel context.…”

Section: Methodsmentioning

confidence: 99%

“…Stabilization and/or correction allows the researcher to measure differences between tongue shapes directly from a larger data set, and a headset prevents even within-syllable probe dislocation from the midsagittal plane, which makes the ratios inaccurate. Melo et al (2017) used this method to collect data on alveolarvelar productions in 15 TD Brazilian-Portuguese children aged 4;7-7;5 and 20 adult speakers. They first averaged multiple repetitions of productions of /k/ and /t/ in open vowel contexts and then compared them using the inbuilt t-test function in Articulate Assistant Advanced software (Articulate Instruments Ltd, 2014).…”

Section: Uti Studies Of the Alveolar-velar Contrastmentioning

confidence: 99%

“…Here, it is 42; see Figure 1.) Melo et al (2017) report the number of significant differences in radial fanlines in two separate regions roughly comprising the front and back of the tongue. The t test reliably distinguished /t/ and /k/ in TD children.…”

Section: Uti Studies Of the Alveolar-velar Contrastmentioning

confidence: 99%

“…Study 2 then applied these norms to illustrate the utility of this measure for classifying and quantifying the speech of children with a history of persistent velar fronting as they develop the contrast longitudinally. In this study, we also applied the t-test measure described in Melo et al (2017) and Cleland et al (2015) to determine whether children with persistent velar fronting achieve statistically significant differences in tongue shape for /t/ and /k/ before, during, and after intervention. We hypothesized that prior to intervention, children with a history of velar fronting would show values near zero in our new measure, coupled with nonsignificant t-test results comparing tongue-shape splines for /t/ and /k/ that is, a complete merger between /t/ and /k/ (Cleland et al, 2017).…”

Section: Purposementioning

confidence: 99%

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The Dorsal Differentiation of Velar From Alveolar Stops in Typically Developing Children and Children With Persistent Velar Fronting

Cleland

Scobbie

2021

J Speech Lang Hear Res

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Purpose This study has two key aims: first, to provide developmental articulatory norms for the alveolar–velar distinction in 30 English-speaking typically developing (TD) children; second, to illustrate the utility of the reported measures for classifying and quantifying the speech of children with a history of persistent velar fronting as they develop the contrast longitudinally. Method This study involved secondary data analysis of the UltraSuite corpus comprising ultrasound tongue imaging recordings of speech materials from 30 typical children and longitudinal data from five children with persistent velar fronting undergoing ultrasound visual biofeedback intervention. We present two new measures of coronal dorsal differentiation: KTMax and KT crescent area. These measures distinguish /k/ and /t/ by quantifying the magnitude of this distinction in absolute spatial terms (mm of linear dorsal difference). For the typical children, we report these measures in corner vowel contexts. We then compare these to dorsal productions by the children with speech disorders, before, during, and after intervention. Results Both measures reliably distinguished /k/ and /t/ in TD children. There was an effect of vowel, with larger KTmax and KT crescent area in /a/ and /o/ vowel contexts than in an /i/ context. The children with persistent velar fronting showed KTmax values near zero before intervention, showing a complete merger between /k/ and /t/. During intervention, they showed variable KTmax values. Post intervention, they showed values within the range of typical children. Conclusions This study provides articulatory norms derived from ultrasound tongue imaging for the dorsal differentiation in alveolar and velar stops in TD children. By applying these norms to children with persistent velar fronting as they acquire this contrast, we see that /k/ is acquired in an articulatorily gradient manner.

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Is there an order of loss of sounds in speakers with Parkinson’s disease?

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Miller

Kitsou

2018

Clinical Linguistics & Phonetics

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Influential reports on speech changes in people with Parkinson's disease (Logemann et al, 1978(Logemann et al, , 1981 reported a posterior to anterior pattern of loss of speech sound accuracy. These claims have never been examined. In a partial replication of Logemann et al's work we examined whether posterior lingual sounds are most affected in people with Parkinson's disease, followed by anterior lingual sounds then labial sounds. Ninety-nine people with PD (age mean 70.7, SD 8.46; time since diagnosis mean 6.97, SD 6.2) with mild to severe overall motor symptoms (Hoehn and Yahr stages 1-5, median 2.5) completed a diagnostic intelligibility test. This was scored by 60 listeners unfamiliar with PD and dysarthric speech.We calculated the proportion of posterior vs anterior lingual vs labial sounds misrecognized by the listeners. We compared profiles of misperceived sounds within and across Hoehn and Yahr stages of severity, and in relation to Unified Parkinson's Disease Rating Scale and speech intelligibility scores. Speech accuracy declined significantly in relation to overall motor impairment for labial and anterior lingual sounds but not for velar sounds. Speech sound accuracy was strongly associated with intelligibility outcomes (p = <0.01). Contrary to previous assertions, there was no evidence supporting the existence of a posterior to anterior order of 'loss' of oral speech sounds in people with PD, nor an interaction of anteriorposterior speech profile changes with Hoehn and Yahr stage. Findings support the notion that a common underlying impairment of movement downscaling affects all sounds similarly and simultaneously in PD from the start.

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O contraste entre oclusivas alveolares e velares em dados típicos de fala: análises acústica e ultrassonográfica

Cited by 3 publications

References 22 publications

Movimentos de língua na produção do /l/ em crianças com e sem distúrbios dos sons da fala em diferentes faixas etárias

Movimentos de língua na produção do /l/ em crianças com e sem distúrbios dos sons da fala em diferentes faixas etárias

The Dorsal Differentiation of Velar From Alveolar Stops in Typically Developing Children and Children With Persistent Velar Fronting

Is there an order of loss of sounds in speakers with Parkinson’s disease?

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