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      O impacto do contexto da disfluência na organização temporal de consoantes na gagueira Translated title: The impact of a dysfluency environment on the temporal organization of consonants in stuttering

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          Abstract

          Objetivo Analisar e comparar o voice onset time (VOT) em falantes do português brasileiro com e sem gagueira, com foco em três momentos diferentes de discurso: fala fluente, pré-disfluência e pós-disfluência. Métodos Foram feitas gravações da fala de 20 participantes (n=10 com gagueira e n=10 sem gagueira). Os dados foram transcritos e segmentados para análise acústica e segmentos de oclusivas não vozeadas do Português Brasileiro, /p/, /t/ e /k/ foram extraídos. Os segmentos foram classificados por grupo - se foram produzidos por pessoas que gaguejam (PG) ou por pessoas que não gaguejam (PnG) - e de acordo com o contexto/ambiente de fala (ou seja, na fala fluente, na pré-disfluência, e na pós-disfluência). Os testes Friedman e Wilcoxon foram utilizados para comparação dentro dos grupos e o teste de Mann-Whitney, em comparações intergrupos. As análises estatísticas foram executadas usando SPSS 14.0, com nível de significância de α=0,05. Resultados O VOT de falantes com e sem gagueira diferiu mais no ambiente de pré-disfluência, durante o qual, falantes com gagueira apresentaram VOT significativamente mais longo do que falantes que não gaguejavam. Depois de passar por um momento de disfluência, no entanto, o VOT dos participantes com gagueira retornou a medidas semelhantes às pessoas que não gaguejavam. Conclusão Nos ambientes de pré-disfluência e pós-disfluência, as PG produzem VOT mais longos do que as PnG. Já no discurso fluente de PG, as oclusivas se comportam de forma diferente. São discutidas as implicações desses resultados para o controle motor da fala.

          Translated abstract

          Purpose To analyze and compare the voice onset time (VOT) in Brazilian Portuguese speakers who stutter and those who do not, focusing on three different moments of speech: fluent, pre-dysfluent and post-dysfluent environments. Methods Twenty participants (n=10 with stuttering and n=10 without stuttering) were recorded. The data were transcribed and segmented for acoustic analysis, and it was extracted tokens of Brazilian Portuguese voiceless stops /p/, /t/ and /k/. Tokens were classified according to whether they were produced by people who stutter (PWS) or by people who do not stutter (PWnS), and according to their environment in speech (i.e., in fluent speech, pre-dysfluency, and post-dysfluency). For comparisons within groups it were used the Friedman and Wilcoxon tests, and the Mann-Whitney test was used in intergroup comparisons. Statistical analyses were executed using SPSS 14.0 with the significance level set at α=0.05. Results VOT in stuttering and non-stuttering speakers differed most in the environment of pre-dysfluencies, during which stuttering speakers show significantly longer VOT than speakers who do not stutter. After passing through a moment of dysfluency, however, stuttering speakers’ VOT returns to measures similar to non-stuttering speakers’. Conclusion In pre-dysfluent and post-dysfluent speech, PWS produces longer VOT than PWnS. In the fluent speech of PWS, the stops behave differently. The implications of these results for speech motor control are discussed.

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          Stuttering and the basal ganglia circuits: a critical review of possible relations.

          Per Alm (2004)
          The possible relation between stuttering and the basal ganglia is discussed. Important clues to the pathophysiology of stuttering are given by conditions known to alleviate dysfluency, like the rhythm effect, chorus speech, and singing. Information regarding pharmacologic trials, lesion studies, brain imaging, genetics, and developmental changes of the nervous system is reviewed. The symptoms of stuttering are compared with basal ganglia motor disorders like Parkinson's disease and dystonia. It is proposed that the basal ganglia-thalamocortical motor circuits through the putamen are likely to play a key role in stuttering. The core dysfunction in stuttering is suggested to be impaired ability of the basal ganglia to produce timing cues for the initiation of the next motor segment in speech. Similarities between stuttering and dystonia are indicated, and possible relations to the dopamine system are discussed, as well as the interaction between the cerebral cortex and the basal ganglia. Behavioral and pharmacologic information suggests the existence of subtypes of stuttering. As a result of this activity, the reader will (1) become familiar with the research regarding the basal ganglia system relating to speech motor control; (2) become familiar with the research on stuttering with indications of basal ganglia involvement; and (3) be able to discuss basal ganglia mechanisms with relevance for theory of stuttering.
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            Protocolo para a avaliação da fluência da fala

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              Princípios de Anatomia e Fisiologia em Fonoaudiologia

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                acr
                Audiology - Communication Research
                Audiol., Commun. Res.
                Academia Brasileira de Audiologia (São Paulo )
                2317-6431
                March 2015
                : 20
                : 1
                : 10-17
                Affiliations
                [1 ] Universidade de Brasília Brazil
                [2 ] Universidade Federal de Minas Gerais Brazil
                Article
                S2317-64312015000100003
                10.1590/S2317-64312015000100001482
                214afc88-72c2-4e16-b36d-21bd14c45bc8

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=2317-6431&lng=en
                Categories
                AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY
                REHABILITATION

                Audiology,Physiotherapy
                Stuttering,Acoustics,Planning,Motor skills,Speech,Gagueira,Acústica,Planejamento,Destreza motora,Fala

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