A submatrix-based P300 brain-computer interface stimulus presentation paradigm  

作　　者：Jin-he SHI Ji-zhong SHEN Yu JI Feng-lei DU 

机构地区：[1]Department of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China [2]Bio-x Laboratory,Department of Physics,Zhejiang University,Hangzhou 310027,China

出　　处：《Journal of Zhejiang University-Science C(Computers and Electronics)》2012年第6期452-459,共8页浙江大学学报C辑（计算机与电子（英文版）

基　　金：Project (No. 61071062) supported by the National Natural Science Foundation of China

摘　　要：The P300 event-related potential (ERP), with advantages of high stability and no need for initial training, is one of the most commonly used responses in brain-computer interface (BCI) applications. The row/column paradigm (RCP) that flashes an entire column or row of a visual matrix has been used successfully to help patients to spell words. However, RCP remains subject to errors that slow down communication, such as adjacency-distraction and double-flash errors. In this paper, a new visual stimulus presentation paradigm called the submatrix-based paradigm (SBP) is proposed. SBP divides a 6×6 matrix into several submatrices. Each submatrix flashes in single cell paradigm (SCP) mode and separately performs an ensemble averaging method according to the sequences. The parameter of sequence number is used to improve further the accuracy and information transfer rate (ITR). SBP has advantages of flexibility in division of the matrix and better expansion capability, which were confirmed with different divisions of the 6×6 matrix and expansion to a 6×9 matrix. Stimulation results show that SBP is superior to RCP in performance and user acceptability.The P300 event-related potential （ERP）, with advantages of high stability and no need for initial training, is one of the most commonly used responses in brain-computer interface （BCI） applications. The row/column paradigm （RCP） that flashes an entire column or row of a visual matrix has been used successfully to help patients to spell words. However, RCP remains subject to errors that slow down communication, such as adjacency-distraction and double-flash errors. In this paper, a new visual stim- ulus presentation paradigm called the submatrix-based paradigm （SBP） is proposed. SBP divides a 6×6 matrix into several sub- matrices. Each submatrix flashes in single cell paradigm （SCP） mode and separately performs an ensemble averaging method according to the sequences. The parameter of sequence number is used to improve further the accuracy and information transfer rate （ITR）. SBP has advantages of flexibility in division of the matrix and better expansion capability, which were confirmed with different divisions of the 6×6 matrix and expansion to a 6×9 matrix. Stimulation results show that SBP is superior to RCP in performance and user acceptability.

关 键 词：Brain-computer interface Event-related potentials P300 speller Submatrix-based paradigm 

分 类 号：TP399[自动化与计算机技术—计算机应用技术] R318[自动化与计算机技术—计算机科学与技术]