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Research Article | Open Access

Steady-state visual evoked potential (SSVEP)-based brain–computer interface (BCI) of Chinese speller for a patient with amyotrophic lateral sclerosis: A case report

Nanlin Shi1, Liping Wang2, Yonghao Chen1, Xinyi Yan1, Chen Yang1, Yijun Wang3, Xiaorong Gao3( )
Biomedical Engineering Department, Tsinghua University, Beijing 100084, China;
Neurology Department, Peking University Third Hospital, Beijing 100191, China;
State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
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Abstract

This study applied a steady-state visual evoked potential (SSVEP) based brain–computer interface (BCI) to a patient in lock-in state with amyotrophic lateral sclerosis (ALS) and validated its feasibility for communication. The developed calibration-free and asynchronous spelling system provided a natural and efficient communication experience for the patient, achieving a maximum free-spelling accuracy above 90% and an information transfer rate of over 22.203 bits/min. A set of standard frequency scanning and task spelling data were also acquired to evaluate the patient’s SSVEP response and to facilitate further personalized BCI design. The results demonstrated that the proposed SSVEP-based BCI system was practical and efficient enough to provide daily life communication for ALS patients.

Keywords

steady-state visual evoked potential (SSVEP)amyotrophic lateral sclerosis (ALS)brain–computer interface (BCI)

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Journal of Neurorestoratology
Volume 8 Issue 1,
March 2020
Pages 40-52
DOI: 10.26599/JNR.2020.9040003
Cite this article:
Shi N, Wang L, Chen Y, et al. Steady-state visual evoked potential (SSVEP)-based brain–computer interface (BCI) of Chinese speller for a patient with amyotrophic lateral sclerosis: A case report. Journal of Neurorestoratology, 2020, 8(1): 40-52. https://doi.org/10.26599/JNR.2020.9040003

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Received: 19 January 2020
Revised: 07 February 2020
Accepted: 13 February 2020
Published: 05 March 2020
© The authors 2020

This article is published with open access at http://jnr.tsinghuajournals.com
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