基于OVR-CSP的情绪认知重评脑电信号晚正成分研究

发布时间：2018-05-10 09:53

本文选题：晚正成分 + 情绪调节　；参考：《生物医学工程学杂志》2014年06期

【摘要】：晚正成分(LPP)作为事件相关电位(ERP)的一个重要成分,是研究情绪调节重评进程的理想成分。本研究主要对采集的情绪认知重评脑电信号的LPP进行处理分析。基于EGI64导脑电采集系统采集16名被试的情绪认知重评脑电数据,首先采用独立成分分析(ICA)算法去除脑电信号中的眼电、肌电等噪声;然后用一对多-公共空间模式(OVR-CSP)算法对Pz电极的脑电信号进行特征提取;最后对提取的LPP成分进行时域及空域分析。结果表明:1从波幅的角度来比较:认知重评诱发的波幅显著大于观看中性诱发的波幅,而小于观看负性诱发的波幅。2从时间进程的角度来比较:经过OVR-CSP特征提取处理后,认知重评与自由观看组的差异发生在0.3~1.5s;而经过叠加平均方法处理后,认知重评与自由观看组的差异发生在0.3~1.25s。以上结果说明OVR-CSP算法不仅能以较少的试验次数准确提取LPP,为后续研究认知重评策略调节LPP提供较好的方法,同时也能为认知重评在情绪调节方面提供神经生理学依据。
[Abstract]:LPP, as an important component of event-related potential (ERP), is an ideal component to study the process of reassessment of emotion regulation. In this study, the LPP processing of the collected EEG signals was analyzed. The EEG data of 16 subjects were collected based on the EEG acquisition system. Firstly, the EMG and EMG were removed by the independent component analysis (ICA) algorithm. Then the OVR-CSP algorithm is used to extract the features of the Pz electrode, and the extracted LPP components are analyzed in the time domain and the spatial domain. The results showed that the amplitude induced by cognitive reassessment was significantly larger than that induced by neutral viewing, but smaller than that induced by negative viewing. 2. From the point of view of time process, the results showed that the amplitude of cognitive reassessment was significantly higher than that of neutral viewing. The difference between the cognitive reassessment and the free viewing group occurred at 0.3 ~ 1.5 seconds, and the difference between the cognitive reassessment group and the free viewing group occurred at 0.3or 1.25 s after the superposition average method. The above results show that OVR-CSP algorithm can not only accurately extract LPPs with less experimental times, but also provide neurophysiological basis for cognitive reassessment in emotional regulation.
【作者单位】：常州大学信息科学与工程学院;常州市生物医学信息技术重点实验室;南京大学社会学院心理系;
【基金】：国家自然科学基金资助项目(61201096) 常州市科技项目资助(CE20135060,CM20123006,CJ20130026) 江苏省“青蓝工程”资助项目
【分类号】：R741.044;TP391.41

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