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作者:

Li, Ming-Ai (Li, Ming-Ai.) (学者:李明爱) | Han, Jian-Fu (Han, Jian-Fu.) | Duan, Li-Juan (Duan, Li-Juan.) (学者:段立娟)

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摘要:

Combination of the Motor Imagery EEG (MI-EEG) imaging and Deep Convolutional Neural Network is a prospective recognition method in brain computer interface. Nowadays, the frequency or time-frequency analysis has been applied to each channel of MI-EEG signal to obtain a spatio-frequency or time-frequency image, and even the images from several channels are infused to generate a combined image. However, the real position information of channels or electrodes is lost in these MI-EEG images, and this is contradictory to the activation area of MI-tasks. In this paper, the MI period and the frequency band covered by mu and beta rhythms are divided into ten time windows and three sub-bands, respectively. Then, for each electrode, Fast Fourier Transform (FFT) is employed to transform each time window to spectrum, and its inverse FFT is calculated for each sub-band. The time-domain powers of ten time windows are averaged for the same sub-band. So, three average powers are generated as the time-frequency features of each electrode of MI-EEG. They are further arranged to the electrode coordinate figure by using Clough-Tocher interpolation algorithm, and a complicated image, in which the time-frequency features are correctly located at the real position of each electrode, is obtained to embody the MI-EEG in detail. Furthermore, a VGG network is modified to perform effective recognition for MI-EEG image, and it is called mVGG. Extensive experiments are conducted on three publicly available datasets, and the 10-folds cross validation accuracies of 88.62%, 92.28% and 96.86% are achieved respectively, and they are higher than that of the state-of-the-art imaging methods. Kappa values and ROC curves demonstrate our method has lower class skew and error costs. The experimental results show that the effectiveness of proposed MI-EEG imaging method, and it is well-matched with mVGG.

关键词:

interpolation method MI-EEG imaging method Brain computer interface convolutional neural network machine learning

作者机构:

  • [ 1 ] [Li, Ming-Ai]Beijing Univ Technol, Fac Informat Technol, Beijing 100124, Peoples R China
  • [ 2 ] [Han, Jian-Fu]Beijing Univ Technol, Fac Informat Technol, Beijing 100124, Peoples R China
  • [ 3 ] [Duan, Li-Juan]Beijing Univ Technol, Fac Informat Technol, Beijing 100124, Peoples R China
  • [ 4 ] [Li, Ming-Ai]Beijing Key Lab Computat Intelligence & Intellige, Beijing 100124, Peoples R China

通讯作者信息:

  • 李明爱

    [Li, Ming-Ai]Beijing Univ Technol, Fac Informat Technol, Beijing 100124, Peoples R China;;[Li, Ming-Ai]Beijing Key Lab Computat Intelligence & Intellige, Beijing 100124, Peoples R China

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来源 :

IEEE ACCESS

ISSN: 2169-3536

年份: 2020

卷: 8

页码: 3197-3211

3 . 9 0 0

JCR@2022

被引次数:

WoS核心集被引频次: 37

SCOPUS被引频次: 41

ESI高被引论文在榜: 0 展开所有

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