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. 2019 Nov 7;16:135. doi: 10.1186/s12984-019-0615-8

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© The Author(s) 2019

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. 6 — Real data results: power spectra of the interferometric signals of different pairs. Between sources 14 and 8 of the AAL, only an iso-frequency coupling (peak at 0 Hz) is present (a), sources 57 and 40, only a cross-frequency coupling (peak at -14 Hz) is present (b), sources 22 and 7, both iso and cross-frequency coupling (peaks at 0 and 8 Hz) are present (c), sources 23 and 13, in addition to the iso-frequency peak, several cross-frequency couplings (peaks at -8, 0 and 18 Hz) are present (d)