Analysis of Magnetic Field Inducted in Brain by Multi-Channel Magnetic Stimulation

Multi-channel magnetic stimulation is an efficient method to improve the conventional magnetic stimulation. A multi-channel magnetic brain stimulator was developed and the distribution of magnetic field was calculated by finite-element analysis software-ANSYS. The results show that when five coils work simultaneously, the area where the magnetic flux density is larger than 0.01 T would expand to almost the whole brain region, and the magnetic stimulation depth would be improved. Experiments were performed on ten subjects (mean age 25) using the stimulator, and the EEG power spectrums before and after stimulation were analyzed. The experimental results show that the beta component of EEG obviously increases after magnetic stimulation, and the effect is more obvious by using more coils simultaneously because of the deeper stimulation.

多导脑部磁刺激仪在辅助听觉记忆方面的研究

目的:检验多导脑部磁刺激仪的临床使用效果。方法:受试者16人,分为2组,第一组为对照组,使其在清醒状态下听取具有多信息点的新闻材料(听觉刺激),然后回答关于材料内容的答卷,最后采其脑电;第二组则是在清醒状态下接受经颅磁刺激的同时听取与前一组相同的新闻材料,在接受经颅磁刺激的同时答卷,最后进行采脑电工作,对两组答卷情况和脑电信号进行分析。结果:接受磁刺激组的答卷情况明显好于对照组,脑电信号的功率谱在前额部、颞部、顶部甚至全部脑区都有比对照组更强的兴奋性。结论:多导脑部磁刺激仪可以在一定程度上加强大脑的兴奋性,帮助人们更好地完成相应的工作。