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Effect of higher frequency on the classification of steady-state visual evoked potentials

Authors
Won, Dong-OkHwang, Han-JeongDaehne, SvenMueller, Klaus-RobertLee, Seong-Whan
Issue Date
2월-2016
Publisher
IOP PUBLISHING LTD
Keywords
brain-computer interface; electroencephalogram; steady state visual evoked potentials; visual fatigue
Citation
JOURNAL OF NEURAL ENGINEERING, v.13, no.1
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF NEURAL ENGINEERING
Volume
13
Number
1
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/89650
DOI
10.1088/1741-2560/13/1/016014
ISSN
1741-2560
Abstract
Objective. Most existing brain-computer interface (BCI) designs based on steady-state visual evoked potentials (SSVEPs) primarily use low frequency visual stimuli (e.g., < 20 Hz) to elicit relatively high SSVEP amplitudes. While low frequency stimuli could evoke photosensitivity-based epileptic seizures, high frequency stimuli generally show less visual fatigue and no stimulus-related seizures. The fundamental objective of this study was to investigate the effect of stimulation frequency and duty-cycle on the usability of an SSVEP-based BCI system. Approach. We developed an SSVEP-based BCI speller using multiple LEDs flickering with low frequencies (6-14.9 Hz) with a duty-cycle of 50%, or higher frequencies (26-34.7 Hz) with duty-cycles of 50%, 60%, and 70%. The four different experimental conditions were tested with 26 subjects in order to investigate the impact of stimulation frequency and duty-cycle on performance and visual fatigue, and evaluated with a questionnaire survey. Resting state alpha powers were utilized to interpret our results from the neurophysiological point of view. Main results. The stimulation method employing higher frequencies not only showed less visual fatigue, but it also showed higher and more stable classification performance compared to that employing relatively lower frequencies. Different duty-cycles in the higher frequency stimulation conditions did not significantly affect visual fatigue, but a duty-cycle of 50% was a better choice with respect to performance. The performance of the higher frequency stimulation method was also less susceptible to resting state alpha powers, while that of the lower frequency stimulation method was negatively correlated with alpha powers. Significance. These results suggest that the use of higher frequency visual stimuli is more beneficial for performance improvement and stability as time passes when developing practical SSVEP-based BCI applications.
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