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. 2017 Aug 11;16:103. doi: 10.1186/s12938-017-0391-2

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© The Author(s) 2017

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 — Ear-EEG earpieces with electrode labels. Left ear-EEG labeling convention for the ear-canal electrodes, when looking into the left ear-canal. Middle picture of a left earpiece with indication of the electrode labels. Right the ear-EEG earpiece inserted in the left ear. Labels indicate the positions of the ELA and ELB electrodes in the concha part of the outer ear