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. 2018 Dec 13;12:954. doi: 10.3389/fnins.2018.00954

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Copyright © 2018 Schaworonkow, Caldana Gordon, Belardinelli, Ziemann, Bergmann and Zrenner.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Illustration of phase shifts in sensor space. (A) Topography with three neighboring channels (FCC3h, C3, CCP5h) selected as center electrodes for the local spatial filter. (B) Resting-state EEG sensor space signals of one participant spatially filtered by a Laplacian filter centered on the selected electrode. The events are aligned to the troughs of the C3-centered Laplacian signal. A systematic phase shift is visible in the FCC3h- and CCP5h-centered signal respective to the C3-centered Laplacian signal troughs, with 58.5° and −29.7°, respectively.