Development of Visual Evoked Potential Based Brain-Computer Interface Using Unconsious High Frequency Subliminal Flickering Light and Stochastic Resonance Phenomenon

脑-机接口（BCI）是为闭锁综合征患者开发的一种利用头皮脑电图控制交流辅助设备的脑-机接口。该系统利用阈下闪烁的视觉刺激与频率高于受试者的临界融合频率，这是无法被识别为闪烁的光，和视觉诱发电位记录在初级视觉皮层枕叶区。此外，噪声闪烁的视觉刺激被施加到受试者的周围视野，以诱导神经元的随机共振。在无噪声光的情况下，该方法成功地将视觉诱发电位增强到普通诱发电位的两倍。在在线BCI系统中，健康参与者和脊髓损伤参与者的平均准确率也达到80%。

Brain-Computer Interface(BCI) employing scalp electroencephalogram to control communication aids was developed for persons with locked-in syndrome. The system utilized subliminal flickering visual stimuli with higher frequency than the subject's critical fusion frequency, which were unable to be recognized as flickering light, and visual evoked potential was recorded over the primary visual cortex at the occipital area. Additionally, nosily flickering visual stimuli was applied to the subject's surrounding visual field in order to induce stochastic resonance of the neurons. This proposed approach succeeded to enhance visual evoked potential two times larger than ordinarily evoked potentials without noise light. In online BCI system, eighty percent in average accuracy was also confirmed in both healthy participants and the participant with spinal cord injury.