A Comparison of P300-speller Stimuli Presentation Paradigms for Brain-computer Interface

Brain-Computer Interface (BCI) exploits the ability of human communication and control bypassing the classical neuromuscular communication channels. The BCI system described in this work is P300 speller. Two different paradigms of the P300 speller were proposed for higher accuracy: (i) the Single display (SD) paradigm that flashes each character individually in one stage and (ii) the Region-based (RB) paradigm that arranges six groups of characters into different regions and flashes in two stages. In this paper, we investigated the accuracy of both paradigms by experiments. We present results of two tasks based on 7 subjects who participated in our experiments. Using experimental results, it is shown that comparative or higher spelling accuracy can be achieved with RB paradigm. Further factors that are possibly important for obtaining better accuracy in RB paradigm are discussed..