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. 2018 Jul 3;15:63. doi: 10.1186/s12984-018-0407-6

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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. 1 — Overview of experimental design. a: Experimental procedures. Subject underwent COP measurements at the baseline and during sham stimulation or nGVS. Rest time was set to 1 min between measurements, but 3 min between the baseline and stimulation groups. b: The stimulation conditions for each group. Fade-in and fade-out times were both set to 10 s for nGVS. We performed COP measurement after the fade-in time. nGVS, noisy galvanic vestibular stimulation; COP, center of pressure