Abstract
The communication of a patient with amyotrophic lateral sclerosis is limited and then the quality of lives would be greatly reduced. The patients still maintain the cognitive ability, thus developing an assistive communication interface would greatly help them in daily live. Recently, steady state visually evoked potential (SSVEP) based brain computer interfaces (BCIs) had been successfully developed to help patients. Increasing the accuracy of SSVEP-based BCIs is able to realize the assistive communication interfaces in practical applications. In this study, a modular continuous restricted Boltzmann machine (MCRBM) is proposed to improve the performance of SSVEP-based BCIs. To precisely represent the characteristics of elicited signals of SSVEP, the frequency magnitude, the coefficients of canonical correlation analysis, and the correlations of magnitude square coherence are selected as the features. In the first layer of MCRBM, the continuous restricted Boltzmann machine based neural networks are used as the basic units and applied to accurately estimate by using different types of features. In the second layer of MCRBM, a CRBM is then designed to fuse the decisions and find the final results. The experimental results showed that MCRBM produce higher accuracy compared to CRBM. Therefore, the proposed approach can be adopted in practical applications and then help patients in communicating with others.
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Acknowledgements
The current authors gratefully acknowledge the support provided to this study by the Ministry of Science and Technology, Taiwan, Republic of China, under Contract MOST 107-2637-E-218-005 and Higher Education Sprout Project, Ministry of Education, Taiwan, Republic of China, under Contract 1300-107P735.
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C-CL and C-CC contributed equally to this paper. Y-JC analyzed data and wrote the main paper; B-SL collected all data and provided statistical analysis; C-HY took parts in surveillance of performing the experiment and study design; ECS dedicated his effort to study design and interpretive analysis; C-CL and C-CC designed the study and directed the experiment. All authors discussed the results and implications and commented on the manuscript at all stages.
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Lee, CC., Chuang, CC., Yeng, CH. et al. Using a novel modular continuous restricted Boltzmann machine to SSVEP-based BCIs for amyotrophic lateral sclerosis. Microsyst Technol 28, 221–227 (2022). https://doi.org/10.1007/s00542-019-04589-8
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DOI: https://doi.org/10.1007/s00542-019-04589-8