中文摘要：

近年来各种信号处理技术随着计算能力的提高取得了巨大进展，推动了人机交互（HO）技术的发展．脑机接口（BCI）是一种特殊的人机交互通道，在最近几年引起广泛关注．P300电位是一种事件相关电位，利用诱发人类P300的原理，可以实现基于P300的BCI系统．此类系统以往常用于英文字母的输入，本研究首次设计并开发了一套进行汉字输入的在线P300-BCI系统．系统利用汉字基于笔画的特性简化了F300诱发界面，并据此设计了相应的汉字虚拟键盘．利用此系统进行的在线输入实验表明，此中文BCI的设计是可行的，对系统的进一步完善将可以为汉语系的瘫痪患者的机能恢复提供新的选项．

英文摘要：

The Human-Computer Interaction （HCI） technology realm has witnessed the rise of new HCI channels in recent years, which is powered by enhancement of various signal-processing methods following the computer capacity boost in the last decade. Brain-Computer Interface （BCI）, which has attracted broad notice, is one of such channels. The P300-based BCI utilizes the endogenous P＇300 event related potentials to decode user＇ s intention. Most of previous applications of P＇300-BCI systems were targeted at English letter input. Our research developed the first Chinese input online BCI system based on P300 potentials. We took advantage of the stroke-comprising characteristics of Chinese characters to simplify the P300 induction interface, and designed the Chinese typing virtual keyboard accordingly. Online human experiments showed that the Chinese BCI idea is viable, and further improvement of the system could provide the Chinese-speaking paralyzed patients a new option to restore their body functions.