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TECHNICAL UPDATES
Year : 2014  |  Volume : 9  |  Issue : 5  |  Page : 549-554

Analysis of the effect of repeated-pulse transcranial magnetic stimulation at the Guangming point on electroencephalograms


1 Tianjin Polytechnic University, Tianjin, China
2 Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability, Hebei University of Technology, Tianjin, China
3 Department of Otorhinolaryngology, Tianjin Huanhu Hospital, Tianjin, China
4 Hebei College of Industry and Technology, Shijiazhuang, Hebei Province, China

Correspondence Address:
Xin Zhang
Tianjin Polytechnic University, Tianjin
China
Yuehua Geng
Ph.D., Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability, Hebei University of Technology, Tianjin 300130
China
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Source of Support: Funding: This study was supported by the National Natural Science Foundation of China, No. 31100711, 51377045, 31300818; the Natural Science Foundation of Hebei Province, No. H2013202176. Zhang X, Fu LD, Geng YH, Zhai X, Liu YH. Analysis of the effect of repeated-pulse transcranial magnetic stimulation at the Guangming point on electroencephalograms. Neural Regen Res. 2014;9(5):549-554., Conflict of Interest: None


DOI: 10.4103/1673-5374.130082

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Here, we administered repeated-pulse transcranial magnetic stimulation to healthy people at the left Guangming (GB37) and a mock point, and calculated the sample entropy of electroencephalo­gram signals using nonlinear dynamics. Additionally, we compared electroencephalogram sample entropy of signals in response to visual stimulation before, during, and after repeated-pulse tran­scranial magnetic stimulation at the Guangming. Results showed that electroencephalogram sample entropy at left (F3) and right (FP2) frontal electrodes were significantly different depending on where the magnetic stimulation was administered. Additionally, compared with the mock point, electroencephalogram sample entropy was higher after stimulating the Guangming point. When visual stimulation at Guangming was given before repeated-pulse transcranial magnetic stimula­tion, significant differences in sample entropy were found at five electrodes (C3, Cz, C4, P3, T8) in parietal cortex, the central gyrus, and the right temporal region compared with when it was given after repeated-pulse transcranial magnetic stimulation, indicating that repeated-pulse transcranial magnetic stimulation at Guangming can affect visual function. Analysis of electroencephalogram revealed that when visual stimulation preceded repeated pulse transcranial magnetic stimulation, sample entropy values were higher at the C3, C4, and P3 electrodes and lower at the Cz and T8 electrodes than visual stimulation followed preceded repeated pulse transcranial magnetic stimula­tion. The findings indicate that repeated-pulse transcranial magnetic stimulation at the Guangming evokes different patterns of electroencephalogram signals than repeated-pulse transcranial mag­netic stimulation at other nearby points on the body surface, and that repeated-pulse transcranial magnetic stimulation at the Guangming is associated with changes in the complexity of visually evoked electroencephalogram signals in parietal regions, central gyrus, and temporal regions.


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