Subject-Independent Classification of Motor Imagery Tasks in EEG Using Multisubject Ensemble CNN
Subject-independent (SI) classification is a major area of investigation in Brain-Computer Interface (BCI) that aims to construct classifiers of users’ mental states based on collected electroencephalogram (EEG) of independent subjects. Significant inter-subject variabilities in the EEG are among the most challenging issues in designing SI BCI systems. In this
work, we propose and examine the utility of Multi-Subject Ensemble Convolutional Neural Network (MS-En-CNN) for SI classification of motor imagery (MI) tasks. The base classifiers used in MS-En-CNN have a fixed CNN architecture (referred to as DeepConvNet) that are trained using data collected from multiple subjects during the training process. In this regard, training subjects are divided into [Formula Omitted]-folds using which [Formula Omitted] base DeepConvNets are trained based on data from [Formula Omitted] folds, whereas the hyperparameter optimization is performed using the held-out fold. We evaluate the performance of the MS-En-CNN on the large open-access MI dataset from the literature, which includes 54 participants and a total number of 21,600 trials. The result shows that the MS-En-CNN achieves the highest single-trial SI classification performance reported on this dataset. In particular, we obtained SI classification performances with average and median accuracies of 85.42% and 86.50% (± 10.16%), respectively. This result exhibits a statistically significant improvement ([Formula Omitted]) over the best previously reported result with an average and a median accuracy of 84.19% and 84.50% (±10.08%), respectively.
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Podrobná bibliografie
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Publikováno v
- IEEE access
Ročník 10; s. 81355 - 81363
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Hlavní autoři
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Dolzhikova, Irina,
Abibullaev, Berdakh,
Sameni, Reza,
Zollanvari, Amin
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Typ dokumentu
- Journal Article
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Jazyk
- English
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Vydáno
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Piscataway
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
2022
IEEE
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Témata
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ISSN
- 2169-3536
2169-3536
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DOI
- 10.1109/ACCESS.2022.3195513
