Simultaneous Decoding of Eccentricity and Direction Information for a Single-Flicker SSVEP BCI
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Simultaneous Decoding of Eccentricity and Direction Information for a Single-Flicker SSVEP BCI. / Chen, Jingjing; Maye, Alexander; Engel, Andreas K; Wang, Yijun; Gao, Xiaorong; Zhang, Dan.
in: ELECTRONICS-SWITZ, Jahrgang 8, Nr. 12, 2019, S. 1554.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Simultaneous Decoding of Eccentricity and Direction Information for a Single-Flicker SSVEP BCI
AU - Chen, Jingjing
AU - Maye, Alexander
AU - Engel, Andreas K
AU - Wang, Yijun
AU - Gao, Xiaorong
AU - Zhang, Dan
PY - 2019
Y1 - 2019
N2 - The feasibility of a steady-state visual evoked potential (SSVEP) brain–computer interface (BCI) with a single-flicker stimulus for multiple-target decoding has been demonstrated in a number of recent studies. The single-flicker BCIs have mainly employed the direction information for encoding the targets, i.e., different targets are placed at different spatial directions relative to the flicker stimulus. The present study explored whether visual eccentricity information can also be used to encode targets for the purpose of increasing the number of targets in the single-flicker BCIs. A total number of 16 targets were encoded, placed at eight spatial directions, and two eccentricities (2.5° and 5°) relative to a 12 Hz flicker stimulus. Whereas distinct SSVEP topographies were elicited when participants gazed at targets of different directions, targets of different eccentricities were mainly represented by different signal-to-noise ratios (SNRs). Using a canonical correlation analysis-based classification algorithm, simultaneous decoding of both direction and eccentricity information was achieved, with an offline 16-class accuracy of 66.8 ± 16.4% averaged over 12 participants and a best individual accuracy of 90.0%. Our results demonstrate a single-flicker BCI with a substantially increased target number towards practical applications.
AB - The feasibility of a steady-state visual evoked potential (SSVEP) brain–computer interface (BCI) with a single-flicker stimulus for multiple-target decoding has been demonstrated in a number of recent studies. The single-flicker BCIs have mainly employed the direction information for encoding the targets, i.e., different targets are placed at different spatial directions relative to the flicker stimulus. The present study explored whether visual eccentricity information can also be used to encode targets for the purpose of increasing the number of targets in the single-flicker BCIs. A total number of 16 targets were encoded, placed at eight spatial directions, and two eccentricities (2.5° and 5°) relative to a 12 Hz flicker stimulus. Whereas distinct SSVEP topographies were elicited when participants gazed at targets of different directions, targets of different eccentricities were mainly represented by different signal-to-noise ratios (SNRs). Using a canonical correlation analysis-based classification algorithm, simultaneous decoding of both direction and eccentricity information was achieved, with an offline 16-class accuracy of 66.8 ± 16.4% averaged over 12 participants and a best individual accuracy of 90.0%. Our results demonstrate a single-flicker BCI with a substantially increased target number towards practical applications.
UR - https://www.mdpi.com/2079-9292/8/12/1554
U2 - 10.3390/electronics8121554
DO - 10.3390/electronics8121554
M3 - SCORING: Journal article
VL - 8
SP - 1554
JO - ELECTRONICS-SWITZ
JF - ELECTRONICS-SWITZ
SN - 2079-9292
IS - 12
ER -
