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. 2019 Jan 28;9:1105. doi: 10.1038/s41598-018-37196-0

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© The Author(s) 2019

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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Spectral waves. (A) A detailed representation of the lower portion the spectrogram recomputed for T_W = 0.08 sec (80 data points) exhibits clear oscillatory patterns. (B) The shape of the two lowest frequency spectral waves is stable with respect to the variation of time window size, T_W. The strikes of different color in the top left corner represent the widths of the four T_W-values used in DPT analysis. The corresponding reconstructed frequencies are shown by the dots of the same color. Although the frequencies obtained for different T_Ws do not match each other exactly, they outline approximately the same shape, which, we hypothesize, reflects the physical pattern of synchronized neuronal activity that produced the analyzed LFP signal. (C) Pie diagrams illustrate the numbers of data points N = 80, N = 160, N = 240, N = 320 and the mean numbers of the regular and the irregular (noisy) harmonics in each case.