Fig. 1

a Epileptic discharge when the current was switched on; b EEG at resting state after epileptic discharge; c After resting stage, brainwaves occurred first in the frontal lobe, their amplitudes were low and their frequencies were slow. d In the progression of brainwaves, the frequencies became slow, but these waves were slow waves that were mainly found in the δ band. e The amplitude reduced, but frequency increased gradually. In addition, brainwaves at δ and θ bands were found, but only a few brainwaves were noted at α band. f Amplitude further reduced and frequency further increased, and then brainwaves retuned to stable level