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. 2018 Aug 20;8:12429. doi: 10.1038/s41598-018-30912-w

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Results of EEG statistical analyses on power ratio data in beta (15–20 Hz) frequency range from central clusters of electrodes. (a) Time course of beta (15–20 Hz) log10 power ratio for each perspective, averaged across right and left central clusters of electrodes and left and right observed moving hands. The figure represents the significant Perspective × Time Window interaction of the 4 (Perspective) × 9 (Time Window) repeated-measures ANOVA performed on central beta log10 power ratio. Each time window within the epoch (ITI, Fixation Cross, Still Hand presentation periods, six Action Observation time windows of 250 ms each) is labelled by different colours. Action observation time windows with both 1) significantly stronger desynchronization for all perspectives with respect to ITI, Fixation Cross and Still Hand presentation periods; and 2) significant differences among perspectives, are indicated by asterisks. (b) Log10 power ratio of central beta frequency range for each perspective, averaged during action observation time windows 2, 3, 4. The figure represents the significant main effect of Perspective in the 4 (Perspective) × 2 (Observed Hand) × 2 (Hemisphere) repeated-measures ANOVA performed on central log10 power ratio in the beta range. All conventions as in Fig. 4.