Abstract
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. ObjectiveTo characterize the cortical auditory evoked potential and the P3 auditory cognitive potential with the vocalic and consonantal contrast stimuli in normally hearing individuals. Method31 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 cross-sectional prospective cohort study. ResultsWe 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. ConclusionThe 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.
Highlights
The study of the P3 auditory cognitive evoked potential, enables the assessment of the neurophysiological cognitive processes which happen in the cerebral cortex, such as memory and auditory attention[1]
It is important to stress that the P3 is considered a cognitive potential different from the others, since it corresponds to the electrical activity which happens in the auditory system when there is discrimination of the rare stimulus among the frequencies
We assessed 31 normal hearing individuals, without past disorders putting them in risk of developing auditory, neurological and language disorders, within the age range between 7 and 30 years, 13 females and 18 males
Summary
The study of the P3 auditory cognitive evoked potential, enables the assessment of the neurophysiological cognitive processes which happen in the cerebral cortex, such as memory and auditory attention[1]. Since this is an objective method, its clinical applicability has been shown in different neurological and mental conditions, alterations in hearing, language, learning and others[2,3,4,5,6]. It is possible to observe the N1, P2 e N2 cortical potentials for the frequent stimuli, and the P3 component for the rare stimulus. It is important to stress that the P3 is considered a cognitive potential different from the others, since it corresponds to the electrical activity which happens in the auditory system when there is discrimination of the rare stimulus among the frequencies
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