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β values of some representative common regions evoked by electroacupuncture stimulation. Common regions of activation including left S2, bilateral operculum, left insula, bilateral MOF and right paracentral lobule are presented for all 36 sessions (6 subjects by 6 sessions). Each bar in each graph represents the data from one experimental session in order of session 1 to session 6. Alternating colors separate the data of one subject from the next subject.
