Journal
JOURNAL OF NEURAL ENGINEERING
Volume 19, Issue 3, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1741-2552/ac6ae5
Keywords
steady-state visually evoked potential (SSVEP); augmented reality (AR); computer screen (CS); information transfer rate (ITR); brain-computer interface (BCI)
Categories
Funding
- Technology Project of Henan Province [222102310031]
- National Natural Science Foundation of China [61803342]
- National Key R&D Program of China [2020YFC2006100]
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This study investigates the effects of stimulus number for steady-state visual evoked potential (SSVEP)-based brain-computer interface (BCI) in an augmented reality (AR) context. The findings suggest that increasing the stimulus number decreases the recognition accuracy of AR-SSVEP but not CS-SSVEP. The SSVEP signal in AR glasses also has a lower signal-to-noise ratio compared to a computer screen.
Objective. The biggest advantage of steady-state visual evoked potential (SSVEP)-based brain-computer interface (BCI) lies in its large command set and high information transfer rate (ITR). Almost all current SSVEP-BCIs use a computer screen (CS) to present flickering visual stimuli, which limits its flexible use in actual scenes. Augmented reality (AR) technology provides the ability to superimpose visual stimuli on the real world, and it considerably expands the application scenarios of SSVEP-BCI. However, whether the advantages of SSVEP-BCI can be maintained when moving the visual stimuli to AR glasses is not known. This study investigated the effects of the stimulus number for SSVEP-BCI in an AR context. Approach. We designed SSVEP flickering stimulation interfaces with four different numbers of stimulus targets and put them in AR glasses and a CS to display. Three common recognition algorithms were used to analyze the influence of the stimulus number and stimulation time on the recognition accuracy and ITR of AR-SSVEP and CS-SSVEP. Main results. The amplitude spectrum and signal-to-noise ratio of AR-SSVEP were not significantly different from CS-SSVEP at the fundamental frequency but were significantly lower than CS-SSVEP at the second harmonic. SSVEP recognition accuracy decreased as the stimulus number increased in AR-SSVEP but not in CS-SSVEP. When the stimulus number increased, the maximum ITR of CS-SSVEP also increased, but not for AR-SSVEP. When the stimulus number was 25, the maximum ITR (142.05 bits min(-1)) was reached at 400 ms. The importance of stimulation time in SSVEP was confirmed. When the stimulation time became longer, the recognition accuracy of both AR-SSVEP and CS-SSVEP increased. The peak value was reached at 3 s. The ITR increased first and then slowly decreased after reaching the peak value. Significance. Our study indicates that the conclusions based on CS-SSVEP cannot be simply applied to AR-SSVEP, and it is not advisable to set too many stimulus targets in the AR display device.
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