当前脑-机接口 (BCI) 发展迅速, 但高性能无创BCI往往需要借助显示设备诱发特定脑电信号, 其中最常用的为计算机屏幕, 因其难以实现可穿戴而限制BCI的便携性.将增强现实技术 (AR) 与BCI相结合形成AR-BCI可以解决这一问题, 提升BCI的实用性.然而已有AR-BCI研究仅有少量报道, 且识别正确率与速度均有待提升.通过采用微软的可穿戴增强现实设备Hololens作为显示设备, 实现一种基于稳态视觉诱发电位 (SSVEP) 的AR-BCI, 通过Hololens设备产生视觉刺激诱发八种频率的SSVEP信号, 分别开展在线与离线实验, 并与基于计算机屏幕的刺激进行比较.参与实验的12名被试成功在增强现实环境中诱发出明显的SSVEP信号, 利用1和2 s长的EEG信号分别实现平均88.67％和98.6％的在线识别正确率.该研究表明, AR-BCI有望在日常生活中实现可穿戴的便携化高性能控制型BCI系统.%Brain-Computer interfaces (BCIs) have improved greatly in the last decades. However, high-performance BCIs usually need display devices to present the visual stimulus to evoke specific EEG patterns. The most popular display device now is computer monitor that is not portable and thus restrict the portability of BCI. By combining argument reality (AR) technology with BCIs, the problem can be resolved, achieving a more practically applicable BCI system. Currently, how to raise the speed and accuracy of AR-BCI remains an open question. This study proposed an AR-BCI system based on Hololens. We generated eight stimuli in the argument reality environment to evoke different steady state visual evoke potentials (SSVEP). Twelve subjects participated in this study and their SSVEP patterns were successfully evoked in AR environment. They achieved 88.67％ and 98.6％ accuracy on average for SSVEP-BCI with EEG data length of 1 s and 2 s respectively. Our Result showed that AR-BCI is promising to achieve a high-performance portable and wearable control system in daily life.
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