IEEE Trans Neural Syst Rehabil Eng. 2024;32:1090-1099. doi: 10.1109/TNSRE.2024.3372594. Epub 2024 Mar 11.
In steady-state visual evoked potential (SSVEP)-based brain-computer interface (BCI) systems, traditional flickering stimulation patterns face challenges in achieving a trade-off in both BCI performance and visual comfort across various frequency bands. To investigate the optimal stimulation paradigms with high performance and high comfort for each frequency band, this study systematically compared the characteristics of SSVEP and user experience of different stimulation paradigms with a wide stimulation frequency range of 1-60 Hz. The findings suggest that, for a better balance between system performance and user experience, ON and OFF grid stimuli with a Weber contrast of 50% can be utilized as alternatives to traditional flickering stimulation paradigms in the frequency band of 1-25 Hz. In the 25-35 Hz range, uniform flicker stimuli with the same 50% contrast are more suitable. In the higher frequency band, traditional uniform flicker stimuli with a high 300% contrast are preferred. These results are significant for developing high performance and user-friendly SSVEP-based BCI systems.
在基于稳态视觉诱发电位 (SSVEP) 的脑-机接口 (BCI) 系统中，传统的闪烁刺激模式在不同频段的 BCI 性能和视觉舒适度之间的权衡上存在挑战。为了研究每个频段具有高性能和高舒适度的最佳刺激范式，本研究系统比较了具有广泛刺激频率范围（1-60 Hz）的不同刺激范式的 SSVEP 特征和用户体验。研究结果表明，为了在系统性能和用户体验之间取得更好的平衡，可以在 1-25 Hz 的频段中使用 Weber 对比度为 50%的 ON 和 OFF 网格刺激来替代传统的闪烁刺激范式。在 25-35 Hz 频段，相同对比度为 50%的均匀闪烁刺激更为适用。在较高频段，优选具有高对比度 300%的传统均匀闪烁刺激。这些结果对于开发高性能和用户友好的基于 SSVEP 的 BCI 系统具有重要意义。
