Abstract
Recently, Brain-Computer Interface (BCI) which allows a user to control external devices or to communicate with other people just by his/her thought has been studied. P300 speller is one of the BCI system for inputting letters which uses P300 as the feature quantity. One matrix interface is usually used for Japanese P300 speller. However, this interface has manycharacters on the display, and it may cause the increase of input time and the decrease of accuracy. In this paper, we propose a new interface which has two matrices in Japanese P300 speller to improve the performance of P300 speller and shows the comparison results between the conventional interface and the proposed one.
