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. 2017 Jul 20;7:5959. doi: 10.1038/s41598-017-06477-5

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© The Author(s) 2017

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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Pre-activation indexes (A) for the high-expected and low-expected trials, and a subset of high-expected trials for which the picture stimuli were predictable with more than 90% certainty. The error-bars show the standard error of the mean. *P < 0.05, **P < 0.01, *** = P < 0.001. (B) a left glass-hippocampus shows the topography of contacts and the values of pre-activation index as shown in (A). Contacts are color-coded by the pre-activation index value which ranged between −0.5 to 0.5 + (the pre-activation indices above 0.5 are color-coded in dark red).