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. 2020 Apr 1;238(5):1177–1189. doi: 10.1007/s00221-020-05782-2

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Time–frequency resolved spectra of COP signals obtained from subject EO, averaged over 20 trials. Black horizontal bars represent frequency of visual stimulation. a Wavelet power spectrum for visual stimulation at 0.2 Hz. b Wavelet power spectrum from visual stimulation at 1.5 Hz. c ITPC spectrum from stimulation at 0.2 Hz. d ITPC spectrum from stimulation at 1.5 Hz. In contrast to the wavelet power spectrum, ITPC revealed strong coherence for stimulation at both 0.2 and 1.5 Hz, with an additional frequency band of high phase coherence at about triple the frequency of visual stimulation for the 1.5 Hz condition