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. 2020 Jun 4;10:9116. doi: 10.1038/s41598-020-65872-7

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© The Author(s) 2020

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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Memory by Age ERP interaction cluster. (A) Mean amplitude of the memory by age ERP interaction averaged across the significant electrodes found in the cluster. The time windows of the significant differences detected in the cluster was from 400 to 1300 ms aprox. (B) The difference wave of the remembered minus the forgotten condition in the young group was contrasted against the same difference wave in the older group, in the cluster analysis. For the figure, the mean was calculated from the grand averages across the 18 electrodes (F3, Fz, F4, FC5, FC1, FC2, FC6, T7, C3, Cz, C4, CP5, CP1, CP2, CP6, Pz, P4) of the cluster. (C) ERP Topoplots (mean amplitude in µV) of the significant cluster of the memory by age interaction. Electrodes where significant differences were detected corresponding to the interaction are highlighted with asterisks. The difference wave of the congruent minus the incongruent condition in the young group was contrasted with the same difference wave in the older group in the cluster analysis. (D) Barplot showing the mean amplitude across the electrodes of the significant cluster of the memory by age interaction, from the significant time-range (380–1256 ms), with the remembered (rem) and forgotten condition (forg) shown for the groups of young and older adults.