Fig. 2. Brain areas activated in the follicular compared with the luteal group (n = 18, respectively) or in the luteal compared with the follicular group (n = 18, respectively) were compared using voxel-by-voxel paired t test. The brain activations were reported if the P value was less than 0.005 or 0.001 (the follicular group in the poststimulation period) or 0.007 (the luteal group in the poststimulation period) uncorrected for multiple comparisons, and if the cluster size was more than 10 voxels. ( A ) The right inferior frontal gyrus and middle frontal gyrus in the prestimulation (anticipation) period of the follicular group. ( B ) The left uncus and amygdala in the prestimulation (anticipation) period of the luteal group. ( C ) The left putamen in the pain stimulation period of the follicular group. ( D ) The right thalamus (medial dorsal nucleus) in the pain stimulation period of the luteal group. ( E ) The right inferior frontal gyrus and middle frontal gyrus in the poststimulation period of the follicular group. ( F ) The left superior temporal gyrus (temporal pole) in the poststimulation period of the luteal group.