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. 2021 Jan 28;11:2480. doi: 10.1038/s41598-021-82281-6

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a–f) Correlations of ERP and MRS measurements in the posterior cingulate gyrus (PCG) region. (a) A significantly positive correlation between mI/Cr ratio and P300 Fz latency (r = 0.224, p = 0.045). (b) A significantly positive correlation between mI/Cr ratio and P300 Cz latency (r = 0.225, p = 0.035). (c) A significantly positive correlation between mI/Cr and P300 Pz latency (r = 0.252, p = 0.038). (d) A significantly negative correlation between NAA/Cr ratio and N200 Fz latency (r = -0.358, p = 0.003). (e) A significantly negative correlation between NAA/Cr ratio and N200 Cz latency (r = − 0.329, p = 0.006). (f) A significantly negative correlation between NAA/Cr ratio and N200 Pz latency (r = − 0.311, p = 0.01). Fz frontal region, Cz central region, Pz parietal region, NAA N-acetylaspartate, Cr creatine, mI myo-inositol.