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. 2018 Jan 18;8:1113. doi: 10.1038/s41598-018-19570-0

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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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The grand-mean ERP waveforms and topographies of the word-evoked frontal P2 component. Waveforms were calculated by averaging the data at the electrodes of Fz, F1 and F2. Topographies were calculated by averaging the data within a time window of 220 to 270 ms after the onset of words.