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. 2018 May 31;8:8451. doi: 10.1038/s41598-018-26779-6

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© The Author(s) 2018

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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Changes in gamma power and frequency induced by the visual presentation of the annular gratings. The grating displayed in panel A either remained static (0°/s) or drifted at one of the three velocities (1.2°/s, 3.6°/s or 6.0°/s) in the direction indicated by the arrows. (B) Grand average time-frequency plots. (C) Grand average spectra of sustained gamma response. Gamma power was computed in the 200–1200 ms time interval after stimulus onset and was normalized to the pre-stimulus baseline (−900 to 0 ms). (D,E) Individual peak frequency (D) and power (E) of sustained gamma responses. Here and hereafter, the frequency range of interest was established where the post-/pre-stimulus power ratio exceeded 2/3 of the peak value. The center of gravity of the power over this frequency range was used as the gamma peak frequency. The average power over these frequencies was used as the gamma peak power (see Material and Methods for details).