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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. 8 — FFT-based spectra obtained from subject EO. Blue lines indicate mean response over 20 trials. Orange dotted lines represent the calculated upper 95% confidence interval of the bootstrapped background. a FFT power spectrum for visual stimulation at 0.2 Hz. b FFT power spectrum from visual stimulation at 1.5 Hz. c FFT-based ITPC spectrum from stimulation at 0.2 Hz. d FFT-based ITPC spectrum from stimulation at 1.5 Hz. The spectra reveal the artifacts resulting from FFT decomposition, particularly in the bootstrapped background of ITPC. These include a drift in low frequencies and substantial noise in higher frequencies (c, d)