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Volume 10, Issue 1 (Winter 2024)
Caspian J Neurol Sci 2024, 10(1): 77-86 |
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Rezvani S, Chaibakhsh A. An Efficient Multiobjective Feature Optimization Approach for Improving Motor Imagery-based Brain-computer Interface Performance. Caspian J Neurol Sci 2024; 10 (1) :77-86
URL: http://cjns.gums.ac.ir/article-1-693-en.html
URL: http://cjns.gums.ac.ir/article-1-693-en.html
1- Department of Mechanical Engineering, Faculty of Mechanical Engineering,, University of Guilan, Rasht, Iran.
2- Department of Dynamics, Control and Vibration, Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran.
2- Department of Dynamics, Control and Vibration, Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran.
Abstract: (886 Views)
Background: Applying efficient feature extraction and selection methods is essential in improving the performance of machine learning algorithms employed in brain-computer interface (BCI) systems.
Objectives: The current study aims to enhance the performance of a motor imagery-based BCI by improving the feature extraction and selection stages of the machine-learning algorithm applied to classify the different imagined movements.
Materials & Methods: In this study, a multi-rate system for spectral decomposition of the signal is designed, and then the spatial and temporal features are extracted from each sub-band. To maximize the classification accuracy while simplifying the model and using the smallest set of features, the feature selection stage is treated as a multiobjective optimization problem, and the Pareto optimal solutions of these two conflicting objectives are obtained. For the feature selection stage, non-dominated sorting genetic algorithm II (NSGA-II), an evolutionary-based algorithm, is used wrapper-based, and its effect on the BCI performance is explored. The proposed method is
implemented on a public dataset known as BCI competition III dataset IVa.
Results: Extracting the spatial and temporal features from different sub-bands and selecting the features with an evolutionary optimization approach in this study led to an improved classification accuracy of 92.19% which has a higher value compared to the state of the art.
Conclusion: The results show that the proposed improved classification accuracy could achieve a high-performance subject-specific BCI system.
Objectives: The current study aims to enhance the performance of a motor imagery-based BCI by improving the feature extraction and selection stages of the machine-learning algorithm applied to classify the different imagined movements.
Materials & Methods: In this study, a multi-rate system for spectral decomposition of the signal is designed, and then the spatial and temporal features are extracted from each sub-band. To maximize the classification accuracy while simplifying the model and using the smallest set of features, the feature selection stage is treated as a multiobjective optimization problem, and the Pareto optimal solutions of these two conflicting objectives are obtained. For the feature selection stage, non-dominated sorting genetic algorithm II (NSGA-II), an evolutionary-based algorithm, is used wrapper-based, and its effect on the BCI performance is explored. The proposed method is
implemented on a public dataset known as BCI competition III dataset IVa.
Results: Extracting the spatial and temporal features from different sub-bands and selecting the features with an evolutionary optimization approach in this study led to an improved classification accuracy of 92.19% which has a higher value compared to the state of the art.
Conclusion: The results show that the proposed improved classification accuracy could achieve a high-performance subject-specific BCI system.
Keywords: Brain-computer interface, Motor imagery, Feature extraction, Feature selection, Optimization
Type of Study: Research |
Subject:
Special
Received: 2024/01/28 | Accepted: 2024/01/20 | Published: 2024/01/20
Received: 2024/01/28 | Accepted: 2024/01/20 | Published: 2024/01/20
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