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Kouhei HARADA Seiji NISHIFUJI Shoichi KAI Kazuyoshi HIRAKAWA
The amplitude and phase of the alpha wave in EEG were studied while flicker stimulation was applied or removed. On applying the stimulation, the amplitude was once attenuated, then entrainment was achieved and reverse phase pattern between posterior and anterior regions was stabilized. As the stimulation was removed, the entrainment state ceased rapidly and the spontaneous activity revived.