Complexity analysis of EEG under magnetic stimulation on acupoint of Guangming(GB37)

Changes in electroencephalogram (EEG) signals under repetitive magnetic stimulation at the acupoint of Guangming (GB37) were analyzed using nonlinear dynamics complexity. C0 complexity is a statistical indicators which can quantify time dynamics of EEG signals. The study compared the C0 complexity under magnetic stimulation at GB37 with those at a mock point, as well as the C0 complexity under visual stimulation before and after magnetic stimulation at GB37. The results showed that the C0 complexity values of EEG signals in the electrode F3,Cz,C4 and P3 were different depending on whether magnetic stimulation was at the GB37 or a mock point (P <; 0.05),and the C0 complexity of magnetic stimulation on GB37 was generally higher than that on mock point. Moreover, EEG signals from visual stimulation before magnetic stimulation at GB37 were significantly different from those after magnetic stimulation at GB37 in two electrodes which were C4 and P3(P <; 0.05). The conclusion of the study is that magnetic stimulation at GB37 has a significant impact on EEG signals. First, EEG complexity during magnetic stimulation at GB37 was significantly higher than that at the mock point in frontal area, central area and parietal area (electrodes F3, Cz, C4 and P3). Second, EEG signals in central area and parietal area (electrodes C4 and P3) resulting from visual stimulation differed depending on whether magnetic stimulation at GB37 was given. The study has important significance for the application of magnetic stimulation on acupoints.