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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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Gamma signals induced by visual presentation of annular gratings drifting at slow, medium, and fast velocities in children and adults. The two upper rows present grand averaged time-frequency plots for the ‘maximal pair’ of gradiometers in children (A) and adults (B). Source localization with DICS beamformer (C) is based on the adults’ data. A transparency factor was applied to mask values that are close to zero. The bottom row is grand averaged spectra of gamma responses for children (D) are adults (E).