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Front. Inform. Technol. Electron. Eng.  2012, Vol. 13 Issue (6): 452-459    DOI: 10.1631/jzus.C1100328
    
A submatrix-based P300 brain-computer interface stimulus presentation paradigm
Jin-he Shi, Ji-zhong Shen, Yu Ji, Feng-lei Du
Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China; Bio-x Laboratory, Department of Physics, Zhejiang University, Hangzhou 310027, China
A submatrix-based P300 brain-computer interface stimulus presentation paradigm
Jin-he Shi, Ji-zhong Shen, Yu Ji, Feng-lei Du
Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China; Bio-x Laboratory, Department of Physics, Zhejiang University, Hangzhou 310027, China
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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.
关键词： Brain-computer interface;  Event-related potentials;  P300 speller;  Submatrix-based paradigm    
Abstract: 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.
Key words: Brain-computer interface    Event-related potentials    P300 speller    Submatrix-based paradigm
收稿日期: 2011-11-08 出版日期: 2012-06-05
CLC:  TP399  
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引用本文:

Jin-he Shi, Ji-zhong Shen, Yu Ji, Feng-lei Du. A submatrix-based P300 brain-computer interface stimulus presentation paradigm. Front. Inform. Technol. Electron. Eng., 2012, 13(6): 452-459.

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http://www.zjujournals.com/xueshu/fitee/CN/10.1631/jzus.C1100328    或    http://www.zjujournals.com/xueshu/fitee/CN/Y2012/V13/I6/452

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