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Enhancing Detection of SSVEPs for a High-Speed Brain Speller Using Task-Related Component Analysis

Open access
Nakanishi, Masaki, Wang, Yijun, Chen, Xiaogang, Wang, Yu-Te, Gao, Xiaorong, Jung, Tzyy-Ping·2018·IEEE Transactions on Biomedical Engineering

Abstract

OBJECTIVE: This study proposes and evaluates a novel data-driven spatial filtering approach for enhancing steady-state visual evoked potentials (SSVEPs) detection toward a high-speed brain-computer interface (BCI) speller. METHODS: Task-related component analysis (TRCA), which can enhance reproducibility of SSVEPs across multiple trials, was employed to improve the signal-to-noise ratio (SNR) of SSVEP signals by removing background electroencephalographic (EEG) activities. An ensemble method was further developed to integrate TRCA filters corresponding to multiple stimulation frequencies. This study conducted a comparison of BCI performance between the proposed TRCA-based method and an extended canonical correlation analysis (CCA)-based method using a 40-class SSVEP dataset recorded from 12 subjects. An online BCI speller was further implemented using a cue-guided target selection task with 20 subjects and a free-spelling task with 10 of the subjects. RESULTS: The offline comparison results indicate that the proposed TRCA-based approach can significantly improve the classification accuracy compared with the extended CCA-based method. Furthermore, the online BCI speller achieved averaged information transfer rates (ITRs) of 325.33 ± 38.17 bits/min with the cue-guided task and 198.67 ± 50.48 bits/min with the free-spelling task. CONCLUSION: This study validated the efficiency of the proposed TRCA-based method in implementing a high-speed SSVEP-based BCI. SIGNIFICANCE: The high-speed SSVEP-based BCIs using the TRCA method have great potential for various applications in communication and control.

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Metadata

Authors
Nakanishi, M., Wang, Y., Chen, X., Wang, Y.-T., Gao, X., & Jung, T.-P.
Venue
IEEE Transactions on Biomedical Engineering
Published
2018-01
Volume
65
Issue
1
Pages
104-112
ISSN
  • 0018-9294 (ISSN-L)
  • 1558-2531
OpenAlex
W2605492512
Cited by
813
References
5
FWCI
25.62
Type
journal article
Language
en
Open access
green

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