“模拟阅读”脑-机接口刺激物样式对正确率的影响

摘要

This paper performs the experiments for imitating reading visual brain‐computer interface ,subjects’ EEG are recorded when they receives different patterns of stimulus ,and then the signals are classified into seven categories .The visu‐al stimulator is a virtual keyboard on the screen ,which displays seven buttons .In the experiment ,by changing the patterns of stimulus below the button(15 kinds) ,the seven subjects’ correct rate are estimated to find a pattern which makes the cor‐rect rate highest .The results show that the same subject’ accuracy in different patterns of stimulus are different and the high‐est accuracy of different subjects may also appeares in different patterns .Moreover ,the subject’ classification accuracy in no background character condition is higher than the background character case with the same target .%采用“模拟阅读”视觉诱发事件相关电位的实验模式进行脑‐机接口实验，记录受试者在不同刺激物样式下的脑电信号并进行模式识别。实验中的视觉刺激器是由显示器上的七个按钮组成的虚拟键盘。在实验中，通过改变按钮下方刺激物的样式（15种），观察七名受试者对虚拟键盘中按钮的识别正确率，以期找到一种刺激物样式使其达到最高。结果表明，同一受试者在不同样式的刺激物下正确率不同，不同受试者的最佳刺激物样式也不一定相同，且在大多数情况下，受试者在无背景字符条件下比相同靶标的有背景字符情况下的正确率高。