To eliminate inter-subject variability, the potentials acquired from each electrode of a subject were normalized with respect to the mean value across all time epochs, electrodes, and experimental conditions in the subject. The potentials obtained from the 7 electrodes in the centro-parieto-occipital region (C3, C4, T5, Pz, T6, O1 and O2) were averaged across all analysis epochs for each condition and of each subject. In the previous studies, it is reported that, when the hypersonic effect emerged, changes in EEG appeared only dozens of secs after the onset of the sound application and remained for nearly 100 secs after the end of the application. Obrazci sertifikatov ob okonchanii kursov anglijskogo yazika. The square root of the averaged power level in the frequency range of 10.0–13.0 Hz at each electrode was set as the equivalent potential of the EEGs in the alpha2 frequency band.
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