Abstract：
:We describe a study designed to assess properties of a P300 brain-computer interface (BCI). The BCI presents the user with a matrix containing letters and numbers. The user attends to a character to be communicated and the rows and columns of the matrix briefly intensify. Each time the attended character is intensified it serves as a rare event in an oddball sequence and it elicits a P300 response. The BCI works by detecting which character elicited a P300 response. We manipulated the size of the character matrix (either 3 x 3 or 6 x 6) and the duration of the inter stimulus interval (ISI) between intensifications (either 175 or 350 ms). Online accuracy was highest for the 3 x 3 matrix 175-ms ISI condition, while bit rate was highest for the 6 x 6 matrix 175-ms ISI condition. Average accuracy in the best condition for each subject was 88%. P300 amplitude was significantly greater for the attended stimulus and for the 6 x 6 matrix. This work demonstrates that matrix size and ISI are important variables to consider when optimizing a BCI system for individual users and that a P300-BCI can be used for effective communication.
journal_name
Biol Psycholjournal_title
Biological psychologyauthors
Sellers EW,Krusienski DJ,McFarland DJ,Vaughan TM,Wolpaw JRdoi
10.1016/j.biopsycho.2006.04.007subject
Has Abstractpub_date
2006-10-01 00:00:00pages
242-52issue
3eissn
0301-0511issn
1873-6246pii
S0301-0511(06)00139-6journal_volume
73pub_type
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