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. 2018 Jul 11;12:277. doi: 10.3389/fnhum.2018.00277

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Copyright © 2018 At least a portion of this work is authored by Gang Chen on behalf of the U.S. Government and, as regards Dr. Chen and the US government, is not subject to copyright protection in the United States. Foreign and other copyrights may apply

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Results of the learning effect. (A) The left hippocampus, the posterior cingulate cortex (PCC) and the superior frontal cortex (SFG) showed stronger activation for the L6 than for the L1 group, whereas the bilateral perirhinal cortex (PRC), the right inferior prefrontal cortex (IFG), bilateral ventrolateral prefrontal cortex (vLPFC) and bilateral insula/thalamus showed stronger activation for the L1 than for the L6 group. (B) The activation of the hippocampus and SFG at each retention interval. (C) The activation of the PRC and vLPFC at each retention interval. The color bar represents the contrast between L1 and L6. The left is on the left side for each brain slice.