The influence of speech stimuli contrast in cortical auditory evoked potentials

Revista Brasileira de Otorrinolaringologia

Lopes, Raquel Caroline Ferreira¹  Vicente, Leticia Cristina²  Alvarenga, Kátia de Freitas³ 

[1] Hospital Santo Antônio - Obras sociais Irmã Dulce, Salvador, Brasil;Universidade Federal de São Carlos, São Carlos, Brasil;Universidade de São Paulo, Brasil

关键词: audiology;    auditory pathways;    electrophysiology;    event-related potentials;    P300;    evoked potentials;    auditory.;   

DOI  :  10.5935/1808-8694.20130059

学科分类：医学（综合）

来源: Associacao Brasileira de Otorrinolaringologia e Cirurgia Cervicofacial

【 摘 要 】

Studies about cortical auditory evoked potentials using the speech stimuli in normal hearing individuals are important for understanding how the complexity of the stimulus influences the characteristics of the cortical potential generated. OBJECTIVE: To characterize the cortical auditory evoked potential and the P3 auditory cognitive potential with the vocalic and consonantal contrast stimuli in normally hearing individuals. METHOD: 31 individuals with no risk for hearing, neurologic and language alterations, in the age range between 7 and 30 years, participated in this study. The cortical auditory evoked potentials and the P3 auditory cognitive one were recorded in the Fz and Cz active channels using consonantal (/ba/-/da/) and vocalic (/i/-/a/) speech contrasts. Design: A crosssectional prospective cohort study. RESULTS: We found a statistically significant difference between the speech contrast used and the latencies of the N2 (p = 0.00) and P3 (p = 0.00) components, as well as between the active channel considered (Fz/Cz) and the P3 latency and amplitude values. These correlations did not occur for the exogenous components N1 and P2. CONCLUSION: The speech stimulus contrast, vocalic or consonantal, must be taken into account in the analysis of the cortical auditory evoked potential, N2 component, and auditory cognitive P3 potential.

【 授权许可】

CC BY