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The left external ear indicating the regions where tVNS has been applied (A-D) and where control stimulation has been applied (E). A: inner side of the tragus, B: anterior, posterior and/or inferior walls of the ear canal, C: cymba conchae, D: cavum conchae, E: earlobe. (This figure is a modification of Fig.1c. found in Yakunina et al., 2016).
