An asynchronously controlled EEG-based virtual keyboard: improvement of the spelling rate |
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Authors: | Scherer Reinhold Müller Gernot R Neuper Christa Graimann Bernhard Pfurtscheller Gert |
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Affiliation: | Institute of Human-Computer Interfaces, Graz University of Technology, 8010 Graz, Austria. reinhold.scherer@tugraz.at |
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Abstract: | An improvement of the information transfer rate of brain-computer communication is necessary for the creation of more powerful and convenient applications. This paper presents an asynchronously controlled three-class brain-computer interface-based spelling device virtual keyboard (VK)], operated by spontaneous electroencephalogram and modulated by motor imagery. Of the first results of three able-bodied subjects operating the VK, two were successful, showing an improvement of the spelling rate sigma, the number of correctly spelled letters/min, up to sigma = 3.38 (average sigma = 1.99). |
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