A facile and flexible motor imagery classification using electroencephalogram signals

•A single channel automatic decomposition and classification method for EEG signal classification.•Exploring multi-cluster channel selection and flexible variational mode decomposition for single channel EEG signal decomposition.•Three types of features have been classified by flexible extreme learn...

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Bibliographic Details
Published in:Computer methods and programs in biomedicine 2020-12, Vol.197, p.105722-105722, Article 105722
Main Authors: Khare, Smith K., Bajaj, Varun
Format: Article
Language:English
Subjects:
Brain-Computer Interfaces
Electroencephalogram signals
Electroencephalography
Flexible extreme learning machine
Flexible variational mode decomposition
Motor imagery classification
Reproducibility of Results
Unsupervised multi-cluster channel selection
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Summary:•A single channel automatic decomposition and classification method for EEG signal classification.•Exploring multi-cluster channel selection and flexible variational mode decomposition for single channel EEG signal decomposition.•Three types of features have been classified by flexible extreme learning machine.•The performance parameters of accuracy, sensitivity, specificity, Mathews correlation coefficient and F-1 measure is obtained as 100%, 100%, 100%, 100%, and 1. Mind machine interface (MMI) enables communication with milieu by measuring brain activities. The reliability of MMI systems is highly dependent on the identification of various motor imagery (MI) tasks. Perfect discrimination of brain activities is required to avoid miscommunication. Electroencephalogram (EEG) signals provide a scrupulous solution for the development of MMI. Analysis of multi-channel EEG signals increases the burden of computation drastically. The extraction of hidden information from raw EEG signals is difficult due to its complex nature. A signal is needed to be decomposed and classified for the extraction of hidden information from it. But selecting the uniform decomposition and hyperparameters for decomposition and classification of the signal can lead to information loss and misclassification. This paper presents a novel method for identifying right-hand and right-foot MI tasks. The method employs a single-channel adaptive decomposition and EEG signal classification. The multi-cluster unsupervised learning method is employed for the selection of significant channel. Further, flexible variational mode decomposition (F-VMD) is used for the adaptive decomposition of signals. The values of decomposition parameters are selected adaptively following the nature of EEG signals. The value of decomposition parameters is used to decompose the signals into narrow-band modes. Hjorth, entropy and quartile based features are elicited from the modes of F-VMD. These features are classified by using a flexible extreme learning machine (F-ELM). F-ELM selects the hyperparameters and kernel adaptively by reducing the classification error. The performance of the proposed method is evaluated by measuring five performance parameters namely accuracy (ACC), sensitivity (SEN), specificity (SPE), Mathew’s correlation coefficient (MCC), and F-1 score. An ACC, SEN, SPE, MCC and F-1 score is obtained as 100%, 100%, 100%, 100%, and 1. The performance parameters obtained by the proposed method prove th
ISSN:0169-2607
1872-7565
DOI:10.1016/j.cmpb.2020.105722