Finally, the spectrum analysis of ΔtHb was used to investigate the significant differences of PFC between male and female groups in resting-state condition. The result indicates that the inferior (Ch. 8, 19, 29, 30 of left-side PFC and Ch. 13, 23, 34, 45 of right-side PFC) and part of dorsolateral PFC (Ch. 7, 38, 39 of right-side PFC) regions are significantly different between male and female groups. Observably, the result of significant differences analysis corresponds to the results of cortical lateralization. They all indicate that the inferior PFC especially in Broca’s area presents the significant differences between male and female groups. Besides, the peaks of frequency in the PFC region are most around at 0.023 Hz in the male group and around at 0.03 Hz in female group. These frequencies we named dominant frequency. In the EEG fields, the brain has delta, theta, alpha, beta and gamma wave whose frequency ranges correlate to brain states from awake to sleep [28]. Is it possible that there are also different frequencies distributes in the brain of resting-state? In this study, the different
