Optimization of BCI speller based on P300 potential

Publication Type

Conference Proceeding Article

Publication Date

9-2005

Abstract

We report our studies on a Brain Computer Interface (BCI) speller application with an aim to optimize its performance and usability. We study the dependence of the spelling accuracy as a function of (a) the number of visual stimuli (repetitions) presented to the user, (b) the P300 segment length used, (c) the number of channels used, and (d) the amount of data used in training, in terms of the number of characters and repetitions. Reducing the number of repetitions results in a direct reduction of the time needed to spell a character, while minimizing the number of channels translates to shorter subject preparation time and thus improves the usability of the system. The usability is further enhanced by decreasing the training required, while maintaining the accuracy. We show that very high accuracies of the order of 99% can be achieved with a short training session of less than 10 minutes using only about 10 channels. The high accuracies, short training and preparation time requirements along with real-time performance make this BCI speller a viable communication tool for severely disabled individuals, who have no other means to communicate with the external world.

Keywords

Brain models, Handicapped persons, Learning systems, Optimization, Patient rehabilitation

Discipline

Databases and Information Systems | Graphics and Human Computer Interfaces

Publication

2005 27th Annual International Conference of the IEEE Engineering in Medicine and Biology Society: Shanghai, China, 31 August - 3 September 2005

First Page

5396

Last Page

5399

ISBN

9780780387409

Identifier

10.1109/IEMBS.2005.1615702

Publisher

IEEE

City or Country

Piscataway, NJ

Additional URL

http://doi.org/10.1109/IEMBS.2005.1615702

Link to Full Text

Share

COinS