High performance P300 speller for brain-computer interface

P300 speller is a communication tool with which one can input texts or commands to a computer by thought. The amplitude of the P300 evoked potential is inversely proportional to the probability of infrequent or task-related stimulus. In existing P300 spellers, rows and columns of a matrix are intens...

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Bibliographic Details
Published inIEEE International Workshop on Biomedical Circuits and Systems, 2004 pp. S3/5/INV - S3/13
Main Authors Cuntai Guan, Thulasidas, M., Jiankang Wu
Format Conference Proceeding
LanguageEnglish
Published IEEE 2004
Subjects
Brain computer interfaces
Computer interfaces
Computer peripherals
Displays
Electroencephalography
Error analysis
Frequency
Muscles
Optimization methods
Principal component analysis
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Summary:P300 speller is a communication tool with which one can input texts or commands to a computer by thought. The amplitude of the P300 evoked potential is inversely proportional to the probability of infrequent or task-related stimulus. In existing P300 spellers, rows and columns of a matrix are intensified successively and randomly, resulting in a stimulus frequency of 1/N (N is the number of rows or columns of the matrix). We propose a new paradigm to display each single character randomly and individually (therefore reducing the stimulus frequency to 1/(N*N)). On-line experiments showed that this new speller significantly improved the performance. Specifically, the new speller can reduce character classification error rate by up to 80% or double the information transfer rate compared to the existing P300 spellers.
ISBN:9780780386655
0780386655
DOI:10.1109/BIOCAS.2004.1454155