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The Spearman's rho correlation between index of pain intensity and brain activity induced by visual stimuli. (a) During the menstrual phase, correlation between the change in hemodynamic signals induced by visual stimuli and the individual's index of pain intensity. (b) During the luteal phase, correlation between the change in hemodynamic signals induced by visual stimuli and the individual's index of pain intensity. HC, healthy controls, PDM, women with primary dysmenorrhea
