南京大学学报(自然科学版) ›› 2023, Vol. 59 ›› Issue (2): 313321.doi: 10.13232/j.cnki.jnju.2023.02.014
Yaolian Song, Xizhe Yin, Jun Yang()
摘要:
脑电图(Electroencephalography,EEG)可记录来自大脑皮层的电信息,反映了脑活动中神经细胞放电产生的电场变化情况.EEG的空间信息和时间信息对于运动想象脑电(Motor Imagery Electroencephalogram,MI?EEG)解码分类模型学习判别特征至关重要,但过度依赖预处理和手工特征提取,导致对EEG数据进行信号分类较为困难.尽管深度学习已经在很多领域实现了自动特征提取,但脑电图的深度学习尚未完成.提出基于FBCSP (Filter Bank Common Spatial Patterns)和Transformer模型的时空特征学习的运动想象脑电解码方法.针对FBCSP滤波的脑电信号,依次通过空间维度和时间维度上的注意力转换来获取空间和时间特征,然后通过Softmax函数对不同类别的EEG数据进行分类.实验结果表明,在BCI竞赛数据集IV?2a上,该方法的分类准确率可达84.16%,为MI脑电信号分类提供了新思路.
中图分类号:
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