基于体感电刺激的脑-机接口实验范式初探（英文）

A Preliminary Study of Brain-Computer Interface Paradigm Based on Electrical Somatosensory Modality

大脑对各类感觉输入(视、听模态)会产生不同的响应信号,脑-机接口正是利用这一响应信号实现大脑与外部设备间直接的通讯.然而以电刺激作为脑-机接口的输入模态还未有报道.本研究尝试通过使用体感电刺激作为脑-机接口的输入,从而诱发事件相关电位(ERP).在整个实验中,分别使用视觉、听觉以及电刺激作为诱发因素,针对每种条件下的事件相关电位及其分类准确率开展对比分析.结果显示电刺激所诱发的事件相关电位幅值较高且具有相对稳定的潜伏期,其分类准确率高于听觉刺激范式.也就表明了以不同刺激强度作为参数的电刺激范式作为脑-机接口应用的可行性,这将进一步拓展脑-机接口的应用领域.

Brain-computer interfaces （BCIs） usually apply the brain signals in responding to various sensory inputs in visual or auditory modalities to provide direct communication pathways to external devices. No early study shows the possibility of using electrical stimuli as BCI input. In this study, we adopted the electrical somatosensory stimuli as the BCI input to elicit event-related potential （ERP）. Three-condition experiment was conducted using visual, auditory and electrical stimuli individually in each condition. We compared the ERP components of each condition as well as the classification accuracy of these three conditions. Results show that electrical stimuli could provide relatively high amplitude and stable latencies of ERP components. It also enjoys higher class-discriminative information and classification accuracy than auditory paradigms. Thus, electrical paradigms with different stimuli intensities could be a good choice for BCI applications, which will enlarge the options for BCI purpose.