Um estudo experimental sobre a percepção do contraste entre as vogais médias posteriores do português brasileiro

Silva, Daniel Márcio Rodrigues; Rothe-Neves, Rui

doi:10.1590/s0102-44502009000200005

Cited by 6 publications

(8 citation statements)

References 27 publications

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“…Os pesquisadores usaram como estímulos uma série de tons complexos que normalmente não seriam reconhecidos como sons da fala, mas podem, mediante instrução, ser identificados como exemplares distorcidos de sílabas variando entre /ba/ e /da/. Efeitos dessas categorias sobre o desempenho em uma tarefa comportamental de discriminação e sobre a MMN foram observados apenas quando os participantes foram instruídos a identificar os estímulos como sílabas, resultado que vai ao encontro de estudos comportamentais que indicam que a discriminação entre sons da fala pode, de acordo com as demandas da tarefa, se dar em um modo categórico ou em um modo não-categórico em que os eventos sonoros são avaliados a partir de parâmetros psicoacústicos contínuos (GERRITS; SCHOUTEN, 2004; SCHOUTEN; GERRITS; VAN HESSEN;2003;SILVA;ROTHE-NEVES, 2009). Näätänen et al (1997) observaram que a vogal /ø/, acusticamente mais próxima a um estímulo padrão /e/, elicia uma MMN com menor amplitude se comparada à vogal // em falantes do estoniano, língua em que essas três vogais são usadas.…”

Section: Manifestações Neurofisiológicas Das Categorias Fônicasunclassified

Respostas evocadas de incongruência a categorias na percepção da fala.

Silva

Rothe-Neves

2014

Let. Hoje (Online)

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Section: Manifestações Neurofisiológicas Das Categorias Fônicasunclassified

Respostas evocadas de incongruência a categorias na percepção da fala.

Silva

Rothe-Neves

2014

Let. Hoje (Online)

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“…Usually, we found descriptions of the development of auditory perception skills of babies (5,6) and experiments of auditory perception with adults (7) . The only exception is a study about the acquisition of auditory perception of contrasts between occlusive vowels of the Brazilian Portuguese (BP) (8) .…”

Section: Introductionmentioning

confidence: 99%

Auditory perceptual performance of children in the identification of contrasts between stressed vowels

Berti

Roque

2013

CoDAS

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Purpose: To assess the auditory perceptual performance of children in a task of identification of vowel contrasts, to classify which phonemes and vowel contrasts provide higher or lower degrees of difficulty, and to verify the influence of age in this performance. Methods: Data recordings of auditory perceptual performance of 66 children in a task of identification using the software Perception Evaluation Auditive & Visuelle (PERCEVAL) were selected from a database. The task consisted of presenting sound stimuli through headphones to children, who would then choose, from two pictures arranged on the computer screen, the one corresponding to the word they heard. The time between auditory inputs and the child's reaction was automatically computed in the software. Results: The perceptual accuracy was 88% and we found a positive correlation with the variable age. The time of response was significantly longer for incorrect answers as opposed to correct answers (p=0.00). Different degrees of similarity in auditory perception were observed, where front vowels were similar more often than back vowels. The tendency for errors was prevalent in the range of non-peripheral to peripheral vowels, which suggests that the latter may serve as a reference or perceptual anchor. Conclusion: The auditory perceptual ability concerning the identification of vowel contrasts is not yet established in the age group studied. The auditory perception of vowel contrasts occurs gradually and asymmetrically, as the order of acquisition in terms of production and perception was not always the same.

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“…Os detalhes da investigação da percepção da fala por meio de tarefas psicoacústicas estão além dos limites do presente trabalho, que pode ser complementado com a discussão mais técnica sobre as tarefas, em SCHOUTEN; GERRITS;VAN HESSEN (2003). Uma breve introdução ao assunto em português encontra-se em SILVA;ROTHE-NEVES (2009).…”

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Distinção de ponto de articulação no Português de Belo Horizonte: exemplos em plosivas e fricativas

Rothe-Neves

Penido

2018

RELIN

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This article deals with the auditory cues used for the distinction of the place of articulation in Brazilian Portuguese (PB). In the first part, we describe the acoustic properties of the fricatives [ʃ] and [s] and the stops [b] and [d] followed by the vowel [a] of Brazilian Portuguese (BP). We analyzed speech samples of seven native BP speakers recorded in Belo Horizonte. Similar duration values were obtained for [ʃ] and [s], as well as for the release phase of oral occlusion in the stops. The prevoicing phase was longer for [b] than for [d]. More prominent amplitude peaks and energy concentration in higher frequency regions were obtained in [s] when compared to [ʃ]. We registered energy peaks in higher frequency regions for [d] as compared to [b]. Finally, F2 was higher at the beginning of formant transition for [a] following [ʃ] and [d] when compared to [s] and [b]. In the second part, eight native speakers of Belo Horizonte performed a classification task. Both the F2 and F3 transition and the center of gravity aided in the distinction of /ʃapa/-/sapa/. The use of fricative noise was different as a function of formant transition, what is compatible with the acoustic description in which the transition was almost null for [s]. For /bata/-/data/, the participants did not use the burst cue for the classification of [b] and [d], only the formant transition. The results confirm that linguistic differences affect the perception of the place of articulation and show which characteristics are used by BP speakers.

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Um estudo experimental sobre a percepção do contraste entre as vogais médias posteriores do português brasileiro

Abstract: Rui ROTHE-NEVES (UFMG)RESUMO

Cited by 6 publications

References 27 publications

Respostas evocadas de incongruência a categorias na percepção da fala.

Respostas evocadas de incongruência a categorias na percepção da fala.

Auditory perceptual performance of children in the identification of contrasts between stressed vowels

Distinção de ponto de articulação no Português de Belo Horizonte: exemplos em plosivas e fricativas

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