期刊
APPLIED SCIENCES-BASEL
卷 12, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/app12052736
关键词
EEG; brain-computer interfaces; motor imagery; machine learning; cross-correlation; frequency power spectrum
类别
资金
- Russian Science Foundation [20-19-00627]
- Russian Science Foundation [20-19-00627] Funding Source: Russian Science Foundation
This study presents a linear discriminant analysis transformation-based approach for classifying three different types of motor imagery in brain-computer interfaces. The results demonstrate that this method improves classification accuracy and successfully discriminates two out of three pairs of motor imagery.
A linear discriminant analysis transformation-based approach to the classification of three different motor imagery types for brain-computer interfaces was considered. The study involved 16 conditionally healthy subjects (12 men, 4 women, mean age of 21.5 years). First, the search for subject-specific discriminative frequencies was conducted in the task of movement-related activity. This procedure was shown to increase the classification accuracy compared to the conditional common spatial pattern (CSP) algorithm, followed by a linear classifier considered as a baseline approach. In addition, an original approach to finding discriminative temporal segments for each motor imagery was tested. This led to a further increase in accuracy under the conditions of using Hjorth parameters and interchannel correlation coefficients as features calculated for the EEG segments. In particular, classification by the latter feature led to the best accuracy of 71.6%, averaged over all subjects (intrasubject classification), and, surprisingly, it also allowed us to obtain a comparable value of intersubject classification accuracy of 68%. Furthermore, scatter plots demonstrated that two out of three pairs of motor imagery were discriminated by the approach presented.
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