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. 2021 May 20;15:648305. doi: 10.3389/fnins.2021.648305

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Copyright © 2021 Peihong, Yuzhu, Tao, Zhaoxuan, Shirui, Yuke, Kunnan, Shenghong, Ruirui and Fang.

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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The study design of included studies. (A) The proportion of induced pain modality. (B) The proportion of acupuncture modality for experimental pain. (C) The proportion of pain assessment scale. (D) The proportion of imaging techniques. EA, electroacupuncture; MA, manual acupuncture; TEAS, transcutaneous electrical nerve stimulation; TENS, transcutaneous electrical nerve; VAS, visual analog scale; GSAS, gracely sensory and affective scales; NRS, numerical rating scale; ERS, expectations for relief scale; MGPQ, McGill pain questionnaire; fMRI, functional MRI; ERP, event-related potential.