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. 2015 Aug 25;12:71. doi: 10.1186/s12984-015-0063-z

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© Hänselmann et al. 2015

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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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Fig. 3 — Design of an online BCI trial. One online trial consisted of a two second baseline interval, a five second motor imagery task and a 2.5–3.5 s pause interval. A green arrow, which was continuously shown during the 5 s of the motor imagery interval, indicated the motor imagery class that the subject had to perform. The MI task classification was obtained during the last 3.75 s of the motor imagery task