摘要
提出了一种基于模拟阅读事件相关电位的脑 -计算机接口 (IR-ERP-BCI) .该 BCI主要由三部分构成 :带有 36个键的虚拟键盘 ,EEG数据采集单元 ,数据处理和目标字符识别单元 .虚拟键盘上 ,每个键的上半部是代表该键名称的字符 ,下半部是一个小窗口 .运行时 ,每个窗口中都有两个标记伴随着符号句按一定时间间隔从右向左平移通过 .当使用者在辨识出目标键的一对指定标记时 ,就会产生一对与这对标记锁时的 ERP成分 .用户的目标键由这对成分的潜伏期以及它们之间的时间间隔来确定 .这种 IR-ERP-BCI消除了容易使人疲惫的突现刺激 ,并极大地抑制了 ERP中突现刺激诱发的外源性的和内源性的脑噪声 .6个被试参加了实验 ,平均传输率达到 87b/ min,视野字符密度高 ,键的大小和间距缩小到 1 .2 cm和 0 .3cm.
This paper presents a brain-computer interface based on imitating-reading-event-related potentials (IR-ERP-BCI). The BCI consists mainly of three parts: a virtual keyboard consisting of 36 buttons, a EEG-sampling unit and a data processing and target letter recognizing unit. Of the virtual keyboard, the top half of each button has the letter representing the button, and the lower half a display window. A pair of signs scroll through each display window along with symbol sentence from right to left in succession at certain intervals during reading. When a user recognizes the pair at the target button, a pair of event-related potentials(ERP)will be evoked with a fixed interval. The target button is determined according to the latencies and the interval between the ERP pair. The IR-ERP-BCI eliminates the use of abrupt stimulus, therefore reduces the exogenous and endogenous brain noises evoked by them. Six subjects participated in the experiment. The average transfer rate is over 87 bits/min. The size of buttons is 1.2cm and the distance between adjacent buttons is 0.3cm for a higher visual-field letter density.
出处
《武汉理工大学学报（交通科学与工程版）》
北大核心
2003年第3期318-321,共4页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家自然科学基金项目资助 (批准号 :396 70 2 13)
中南民族大学自然科学基金资助 (批准号 :YZY0 2 0 12 )
关键词
脑—计算机接口(脑—机接口)
模拟阅读诱发电位
视野字符密度
传输率
brain computer interface (BCI)
imitating-reading-event-related potentials(IR-ERP-BCI)
visual-field letter density
transfer rate
