Acoustic stimulus threshold related to EEG alpha and non-alpha epochs

Abstract

In humans sitting in the dark with their eyes closed the presence of EEG α and non-α epochs was registered automatically and the threshold detection of weak acoustic stimuli and reaction time of responses were measured according to the principles of the von Békésy auudiometer under both conditions. The threshold was higher during α epochs in comparison with non-α ones. The reaction time of responses under both conditions was equal. Presentation of the stimulus did not influence the duration of corresponding α or non-α epochs significantly.