基于复杂度的针刺脑电信号特征提取

摘要

To explore the effects of acupuncture stimulation on brain activities,an experiment is designed that acupunctures at Zusanli point of the right leg are performed at four different frequencies to obtain electroencephalograph （EEG） signals.For the first time the complexity parameter of EEG is extracted by order recurrence plot and correlation dimension method,which reflects the functional state of the brain under acupuncture.The effects of acupuncture on the functional region of brain and correlation among different acupuncture frequencies and the complexity of EEG are investigated.The results show that the complexity of EEG during acupuncture is higher than that before acupuncture and especially during acupuncture at a frequency of 100 times/min.Furthermore,the determinism （DET） extracted from EEG signals of electrodes FP2,F7 and T3 can be used as a characteristic parameter of distinction between the state during acupuncture and the state before acupuncture.%为探究针灸刺激对大脑活动产生的影响,文章设计了4种针刺频率针刺右腿足三里穴获取脑电的实验.首次采用排序递归图和关联维数方法提取针刺脑电信号的复杂度参数来反映针刺大脑的功能状态,并基于这些方法研究了针刺作用对大脑功能区域的影响以及不同针刺频率与脑电复杂度的相关性.发现针刺时脑电的复杂度高于针刺前,尤以频率为100次/min的针刺影响最为明显;从FP2,F7,T3导联脑电中提取的确定性指标（DET）可作为区分针刺状态与针刺前状态的一种特征参数.