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目的对视觉、听觉、体感3种不同模态下靶刺激诱发的事件相关电位(ERP)进行比较研究,探讨体感电刺激作为脑机接口(BCI)一种新的信号诱发模式的可能性,为基于体感ERP的BCI研究提供理论依据。方法选择17例视力或矫正视力正常、听力正常、躯体感觉正常且无任何大脑病史的被试者,其中男性8例,女性9例;年龄20~26岁,平均年龄22.6岁;均为右利手。分别记录17例健康的被试者在视觉、听觉、体感单通道靶刺激下诱发的脑电图;对3类靶刺激下ERP的时域参数(幅值、潜伏期)、行为学数据(反应时间、错误率)、脑源定位进行比较分析。结果 3类靶刺激模式下的ERP波形具有相似性,体感电刺激诱发的ERP幅值与视觉、听觉靶刺激相比无显著性差异;体感电刺激诱发ERP的峰值潜伏期显著长于视觉靶刺激;体感电刺激的反应时间显著长于视觉靶刺激,错误率也高于视觉、听觉靶刺激;体感电刺激诱发ERP的脑内源与视觉靶刺激相比具有相似性。结论相比于视觉、听觉靶刺激,大脑对于体感电刺激的探测难度高,敏感程度低;但从ERP的波形和幅值上看,体感电刺激可以诱发出稳定的、可被检测到的ERP波形,完全有可能应用于BCI系统作为一种新的ERP诱发模式。
OBJECTIVE: To compare the potential event-related potentials (ERPs) induced by target stimuli in three different modes of vision, hearing and somatosensory to explore the possibility of somatosensory electrical stimulation as a new signal-inducing mode of brain-computer interface (BCI) Based on somatosensory ERP BCI study provides a theoretical basis. Methods A total of 17 subjects (8 males and 9 females) with visual acuity or normal vision, normal hearing, normal somatosensory, and no history of cerebral diseases were selected. Methods The age ranged from 20 to 26 years with a mean age of 22.6 years. hand. The EEG images of 17 healthy subjects were recorded under visual, audible and somatosensory stimulation. The time domain parameters (amplitude, latency), ERP data (reaction time , Error rate), brain source location for comparative analysis. Results There were similar ERP waveforms in three kinds of target stimulation modes. There was no significant difference in ERP amplitude induced by somatosensory electrical stimulation compared with visual and auditory target stimulation. The peak latency of ERP induced by somatosensory electrical stimulation was significantly longer than that of visual target stimulation. The response time of electrical stimulation was significantly longer than visual target stimulation, and the error rate was also higher than that of visual and auditory target stimulation. Somatosensory electrical stimulation induced ERP brain endogenous similar to visual target stimulation. Conclusion Compared with visual and auditory target stimulation, the brain is more difficult and less sensitive to detect somatosensory electrical stimulation. However, from the ERP waveform and amplitude, somatosensory electrical stimulation can induce stable and detectable ERP Waveform, it is entirely possible to apply the BCI system as a new ERP-induced model.