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. 2018 Dec 4;17:180. doi: 10.1186/s12938-018-0613-2

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© The Author(s) 2018

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. 3 — a Bundled-optode configuration of 40 channels to detect right-finger movements in the left motor cortex (squares and circles represent emitters and detectors, respectively); b an example of short-/long-channel measurements (short: 1–2, 3–4, 5–6, 7–8; long: 1–4, 1–5, 1–6, 1–8, etc.; for instance, if Ch. 1 is composed of emitter 1 and detector 4, pairs 1–2 and 3–4 are used as a SS channel for Ch.1′s noise removal); and c experimental paradigm (five trials for thumb and little-finger movements each, which were randomly performed)