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. 2015 Dec 15;15:259. doi: 10.1186/s12883-015-0521-z

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© Li et al. 2015

Open AccessThis 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. 2 — Experimental paradigm. Five blocks were included for each run, and each block consisted of 10 trials. Each trial began with a visual and auditory presentation of the task instructions. Next, two number buttons were randomly displayed on the left and right sides of the GUI. After the instruction, the two number buttons flickered, and the two corresponding button frames were highlighted. After 10 s, auditory (i.e., applause) and visual feedback (i.e., number selected by the classification algorithm) were presented