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. 2023 Aug 8;23:521. doi: 10.1186/s12879-023-08331-8

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© The Author(s) 2023

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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Regional ALFF differences between recovered COVID-19 patients and healthy controls. Yellow regions show increased ALFF (hyperactivity), and green regions show decreased ALFF (hypoactivity) in the recovered COVID-19 patients. The difference was calculated by two-tailed two-sample t-test, and the results were FDR-corrected (P < 0.05). ALFF, amplitude of low-frequency fluctuations; HCs, healthy controls; ITG_R, right inferior temporal gyrus (visual processing); ITG_L, left inferior temporal gyrus (visual processing); MTG_R, right middle temporal gyrus (memory, attention, auditory, visual processing); IOG_R, right inferior occipital gyrus (visual processing); MFG_R, right middle frontal gyrus (executive functioning, working memory, attention); MOG_R, right middle occipital gyrus (visual processing); Precuneus_R, right precuneus (visual information, memory, attention)