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. 2019 Jul 4;5:13. doi: 10.1038/s41531-019-0085-5

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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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Fig. 5 — Methods of analysis of the visual response. Example raw EEG traces in a PD patient (red) and a Ctrl subject (black), measured from a cluster of parieto-occipital electrodes during a visual stimulation trial, FG = 100% and SS = 0% contrast. Time frequency analyses, FFT and STFT, were performed to extract the ssVEP amplitude at the frequency of stimulation 25 Hz