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Biomedical Engineering / Biomedizinische Technik

Joint Journal of the German Society for Biomedical Engineering in VDE and the Austrian and Swiss Societies for Biomedical Engineering and the German Society of Biomaterials

Editor-in-Chief: Dössel, Olaf

Editorial Board: Augat, Peter / Habibović, Pamela / Haueisen, Jens / Jahnen-Dechent, Wilhelm / Jockenhoevel, Stefan / Knaup-Gregori, Petra / Lenarz, Thomas / Leonhardt, Steffen / Plank, Gernot / Radermacher, Klaus M. / Schkommodau, Erik / Stieglitz, Thomas / Boenick, Ulrich / Jaramaz, Branislav / Kraft, Marc / Lenthe, Harry / Lo, Benny / Mainardi, Luca / Micera, Silvestro / Penzel, Thomas / Robitzki, Andrea A. / Schaeffter, Tobias / Snedeker, Jess G. / Sörnmo, Leif / Sugano, Nobuhiko / Werner, Jürgen /

6 Issues per year


IMPACT FACTOR 2016: 0.915
5-year IMPACT FACTOR: 1.263

Online
ISSN
1862-278X
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Volume 55, Issue 3

Issues

Volume 57 (2012)

Spatial filters to detect steady-state visual evoked potentials elicited by high frequency stimulation: BCI application

Gary Garcia Molina / Vojkan Mihajlovic
Published Online: 2010-04-26 | DOI: https://doi.org/10.1515/bmt.2010.013

Abstract

Brain-computer interfaces (BCIs) based on steady-state visual evoked potentials (SSVEPs) require minimal user training and can offer higher information throughput compared to other BCI modalities. We focused on SSVEPs elicited by high-frequency stimuli (>30 Hz) because they cause minimal fatigue/annoyance and reduce the risk of inducing photoepileptic seizures. This paper presents an approach that analyzes electroencephalographic activity to automatically obtain the optimum spatial filter for detecting the SSVEP at a given stimulation frequency from a short signal where the stimulation is presented at intermittent periods interspersed with breaks. A vector space generated by sinusoidal signals at the stimulation frequency and harmonics is defined. The spatial filter coefficients result from maximizing the ratio between the energy of the spatially filtered signal and that of its orthogonal component with regard to the vector space. The spatial filters are customized for each BCI user through a short calibration procedure taking into account individual specificity. Our experiments on six subjects applying the spatial filters resulted in an average transfer rate ranging from 20.9 to 22.7 bits/min.

Keywords: brain-computer interface (BCI); high-frequency visual stimulation; spatial filtering; steady-state visual evoked potential (SSVEP)

About the article

Corresponding author: Gary Garcia Molina, Philips Research Europe, High Tech Campus 34 (room 4.033), 5656AE Eindhoven, The Netherlands Phone: +31-40-2747959 Fax: +31-40-2746321


Received: 2009-03-06

Accepted: 2010-01-25

Published Online: 2010-04-26

Published Online: 2010-04-26

Published in Print: 2010-06-01


Citation Information: Biomedizinische Technik/Biomedical Engineering, Volume 55, Issue 3, Pages 173–182, ISSN (Online) 1862-278X, ISSN (Print) 0013-5585, DOI: https://doi.org/10.1515/bmt.2010.013.

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