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Brain Computer Interfaces: OpenViBE as a Platform for a P300 Speller

  • Aside from hardware, a major component of a Brain Computer Interface is the software that provides the tools for translating raw acquired brain signals into commands to control an application or a device. There’s a range of software, some proprietary, like MATLAB and some free and open source (FOSS), accessible under the GNU General Public License (GNU GPL). OpenViBE is one such freely accessible software. This thesis carries out a functionality and usability test of the platform, looking at its portability, architecture and communication protocols. To investigate the feasibility of reproducing the P300 xDAWN speller BCI presented by OpenViBE, users focused on a character on a 6x6 alphanumeric grid which contained a sequence of random flashes of the rows and columns. Visual stimulus is presented to a user every time the character they are focusing on is highlighted in a row or column. A TMSi analog-to-digital converter was used together with a 32-channel active electrode cap (actiCAP) to record user’s Electroencephalogram (EEG) which was then used in an offline session to train the spatial filter algorithm, and the classifier to identify the P300 evoked potentials, elicited as a user’s reaction to an external stimulus. In an online session, the users tried to spell with the application using the power of their brain signal. Aspects of evoked potentials (EP), both auditory (AEP) and visual (VEP) are further investigated as a validation of results of the P300 speller.

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Metadaten
Author:Herbert S. Kisakye
URN:urn:nbn:de:bsz:840-opus-735
Document Type:Bachelor Thesis
Language:English
Year of Completion:2013
Publishing Institution:Hochschule Heilbronn
Release Date:2013/12/02
Tag:Brain; Computer; Interfaces
GND Keyword:Computer; Gehirn
Faculty:Informatik / Medizinische Informatik
DDC classes:000 Allgemeines, Informatik, Informationswissenschaft / 000 Allgemeines, Wissenschaft / 004 Informatik
Access Right:Frei zugänglich
Licence (German):License LogoVeröffentlichungsvertrag für Publikationen mit Print on Demand