Windows环境下脑机接口视觉刺激器的设计

给出了基于视觉诱发电位的脑-机接口模式的方案,该方案的关键部分是视觉刺激器的实现,它提供了用户利用脑电信号识别字符所需的多种刺激模式。在Windows环境下,以闪烁的不同小块代表多种可能的选择,受试者注视其中一个目标,分析诱发电位可判别受试者所注视的目标。实测显示,视窗中的目标图像同时运动时,平滑稳定、无抖动现象,时间精度达到设计要求的1ms,实时向并口输出数据,该方案能有效地诱发出可识别的具有特征性的视觉诱发电位。

Visual Stimulator for Brain-Computer Interface Under Windows

The project of Brain-Computer Interface(BCI) based on visual evoked potential(VEP) is presented in this paper.The critical part of the solution is the realization of the visual stimulator which provides multiple stimulation patterns for user's characters input.Under Windows,Several flickering blocks are adopted to represent a number of possible selections,and then the testee fixate on one object on the screen,which can be distinguished by the analysis of the VEPs.When the visual stimulator runs,the images in the windows move smoothly,stably and simultaneously,and the time accuracy attains the 1ms,transmit data to parallel port in the real-time,Recognizable VEP signal with distinct characteristics can be evoked effectively.