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. 2017 Jun 16;11:313. doi: 10.3389/fnhum.2017.00313

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Copyright © 2017 Ioannides, Liu, Poghosyan and Kostopoulos.

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) or licensor 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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Grand average MEG and EEG power spectra. Spectra for a frontal and parietal midline MEG channels and an EEG channel. Logarithmic scale is used on both the frequency and power axes (log-log plot). (A) Comparison of core periods. (B,C) Comparison of NREM2 core period with periods immediately before and during (B) spindles and (C) KCs. The NREM2 core period spectra (green curves) are shown in all figures. For ease of comparisons the same frequency axis (abscissa) is used in all 9 plots, and the same power axis (ordinate) is used in all MEG (first two columns) plots and in all EEG (third column) plots.