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. 2021 Oct 25;12:6164. doi: 10.1038/s41467-021-26327-3

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© The Author(s) 2021

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. 3 — a Raster plots, normalized cross-correlograms and spike shapes of two concept neurons in the right hippocampus during the presentation of each neuron’s preferred stimulus (pretzel for n1 and strawberry for n2). In the main condition (blue), but not during controls (red) neuron n1 responded to the non-preferred strawberry picture (relational response on lower right). Bottom: Trial-by-trial cross-correlograms between both neurons during each picture presentation with colors as above. Peaks around −250, and +350 ms were present only for second picture presentations in the main condition. b Population plots of trial-by-trial cross-correlograms between all pairs of concept neurons of the same brain region. Data are presented as mean values ± SEM (solid lines and shaded areas). Red horizontal lines indicate significant differences (p < 0.01) between the main-comparison condition and controls as quantified by a two-sided cluster permutation test. Pictures of objects (a) were obtained from https://commons.wikimedia.org under the Creative Commons CC0 1.0 Universal Public Domain Dedication. Source data are provided as a Source Data file.