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. 2014 Dec 16;11:165. doi: 10.1186/1743-0003-11-165

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© Witkowski et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Experimental design: after calibration, all participants controlled the BNCI system under two conditions. During condition #1, EEG was used, while during condition #2 merged EEG and EOG signals were used for BNCI control of the hand exoskeleton. During EEG calibration, either a red square (indicating to rest) or green square (indicating to engage in motor-imagery) was shown. For EOG calibration, participants were asked to either look to the left (blue arrow to the left) or to the right (blue arrow to the right). For evaluation of BNCI control, a visual cue indicated not to move (red square) or to close the hand exoskeleton (green square) over 6 minutes in a random order. Visual indications were separated by inter-trial-intervals (ITIs) of 4-6 sec.