A Virtual Chinese Keyboard BCI System Based on P300 Potentials

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 P300 event related potentials to decode user's intention.Most of previous applications of P300-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.