Fig. 3

P300 amplitude change after electrical stimulation. a ERP topographical maps showing (the differences in) the P300 amplitude obtained from the male and female subjects before and after electrical stimulation. Power was found to increase around the parietal lobe after stimulation in both the female and male groups. In particular, changes around the frontal lobe and parietal lobe were more significant in the female group than in the male group. b Total P300 amplitude difference in the females. The results from five channels were averaged, demonstrating the differences in the P300 amplitude before and after the low-frequency electrical stimulation. In the Real group, the amplitude was significantly increased compared to that of the Sham group