Abstract: Quantitative EEG was continuously recorded prior to and during Zen meditation (Zazen) in 20 monks of the Soto sect (Group P: 10 priests; Group D: 10 disciples) and 10 control subjects with no experience in Zen training (Group C). As shown by an EEG topography during meditation, slow alpha appeared in the majority of subjects regardless of their experience in Zen training, while theta...