We report the implementation of a text input application (speller) based on the P300 event related potential. We obtain high accuracies by using an SVM classifier and a novel feature. These techniques enable us to maintain fast performance without sacrificing the accuracy, thus making the speller usable in an online mode. In order to further improve the usability, we perform various studies on the data with a view to minimizing the training time required. We present data collected from nine healthy subjects, along with the high accuracies (of the order of 95% or more) measured online. We show that the training time can be further reduced by a factor of two from its current value of about 20 min. High accuracy, fast learning, and online performance make this P300 speller a potential communication tool for severely disabled individuals, who have lost all other means of communication and are otherwise cut off from the world, provided their disability does not interfere with the performance of the speller.
P300 evoked potential, brain-computer interface, classification, information transfer rate
Databases and Information Systems | Graphics and Human Computer Interfaces
Data Management and Analytics
International Conference on Advances in Medical Signal and Information Processing 2nd MedSIP 2004, September
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Robust classification of event-related potential for brain-computer interface. (2004). International Conference on Advances in Medical Signal and Information Processing 2nd MedSIP 2004, September. Research Collection School Of Information Systems.
Available at: http://ink.library.smu.edu.sg/sis_research/3334
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