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

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Fig. 6 — aVNS synchronized with a cardiac biosignal, as a based on PPG from the finger. b The stimulation started with a delay of 100 ms with respect to the onset of the rising slope of PPG. c The applied tri-phasic stimulation pattern (applied to all three electrodes)