南京大学学报(自然科学版) ›› 2022, Vol. 58 ›› Issue (2): 264274.doi: 10.13232/j.cnki.jnju.2022.02.010
• • 上一篇
Li Chen1,2, Anmin Gong3, Peng Ding1,2, Yunfa Fu1,2()
摘要:
基于脑电图(Electroencephalography,EEG)信号的运动想象(Motor Imagery,MI)意图识别是脑机接口(Brain?Computer Interface,BCI)研究中的重要问题.然而,EEG信号存在严重的个体性差异,不同被试之间的EEG信号特征空间分布差异很大,不同被试之间的分类模型不能通用.针对这一问题,提出一种基于欧式空间的加权逻辑回归迁移学习方法,算法首先将不同被试的EEG数据进行欧几里得空间对齐,使各信号更加相似,减少差异性,然后计算特定被试共空间模式(Common Spatial Pattern,CSP)获得不同的特征值,并计算这些特征值的KL(Kullback?Leibler)散度,进而利用KL散度调整迁移学习的加权逻辑回归算法,得到分类模型.实验结果表明:对于BCI竞赛IV中的数据集2a,提出的方法可以极大地提升BCI的学习性能,算法分类准确率比基线算法(线性判别分析)高出15%.在数据样本增多的情况下,被试的分类准确性也得到了明显的提升,和同类算法相比,分类准确率提升4%,说明提出的算法能进一步提高BCI的学习性能,改善分类模型的通用性问题.
中图分类号:
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