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. 2022 May 10;112(2):237–246. doi: 10.1007/s10470-022-02037-8

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Open AccessThis 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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Fig. 2 — Block diagram of the multifunctional auricular vagus nerve stimulator for experimental and standalone setup: microcontroller (blue), designed extension hardware (orange), external data acquisition module (green), the human auricle with inserted stimulation electrodes, and electrode inserted into the ear (top right). The blocks marked with “S” are used for standalone setup