Frequency-following response (FFR) with speech stimulus in normal-hearing young adults
Frequency-following response (FFR) com estímulo de fala em jovens adultos normo-ouvintes
Alessandra Spada Durante; Suenia de Jesus Oliveira
Abstract
ABSTRACT Purpose: Analyze the slope, latency and amplitude values of the waveforms V, A, C, D, E, F and O from Frequency-following Response (FFR) with speech stimulus in normal-hearing adults based on a recent international reference study. Method: Eleven normal-hearing adults aged 18-30 years, without hearing complaints, were evaluated in this study using an Intelligent Hearing Systems device. The speech stimulus /da/ was presented to the right ear via insertion phone and the responses were captured by electrodes placed on the vertex, right mastoid bone, and forehead (ground). Results: The descriptive latency values of the components were V 6.50, A 7.87, C 17.74, D 22.77, E 32.07, F 40.03 and O 48.07 ms. The mean amplitude measures of the waves were V 0.17, A -0.12, C -0.14, D -0.14, E -0.20, F -0.22 and O -0.14 µV. The mean slope value was 0.23. Comparison with an international study, Krizman et al. (2012), showed that most of the results are within positive and negative standard deviation values for the assessed age group for slope, latency and amplitude. Conclusion: The electrophysiological measures obtained from Frequency-following Response using the speech stimulus / da/ in normal-hearing adults without hearing complaints showed slope, latency and amplitude values of all FFR components within the normality standard described in the international literature.
Keywords
Resumo
RESUMO Objetivo: Analisar o slope e as latências e amplitudes das ondas V, A, C, D, E, F e da Frequency-Following Response, com estímulo de fala, em adultos com audição normal, tendo como base referência internacional. Método: Onze adultos normo- ouvintes com idade entre 18 e 30 anos, sem queixas auditivas, foram avaliados na pesquisa. O equipamento utilizado foi o Intelligent Hearing System. O estímulo de fala /da/ foi apresentado por meio de fone de inserção na orelha direita e a resposta foi captada por meio de eletrodos posicionados no vértex, na mastoide direita e eletrodo terra na fronte. Resultados: Os valores descritivos de latência dos componentes foram: V 6,50, A 7,87, C 17,74, D 22,77, E 32,07, F 40,03 e O 48,07 ms. As médias de amplitude foram V 0,17, A -0,12, C -0,14, D -0,14, E -0,20, F -0,22 e O -0,14 µV. A média do valor do slope encontrada foi 0,23. Na comparação com estudo de referência internacional, Krizman et al. (2012) mostraram que a maioria dos resultados se encontra dentro de um desvio padrão positivo e negativo para a faixa etária estudada tanto para o slope quanto para as latências e amplitudes. Conclusão: A resposta eletrofisiológica da Frequency Following Response, utilizando o estímulo de fala /da/, em adultos com audição normal e sem queixas auditivas, apresentou valores de slope e de latência e amplitude de todos os componentes dentro do padrão de normalidade apresentado pela literatura internacional.
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Referências
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Submetido em:
15/02/2019
Aceito em:
26/07/2019
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