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Traditional adhesive electrodes used in taVNS, however, often lack precision, resulting in inconsistent stimulation and undesirable side effects. To address these challenges, this study proposes a novel microneedle\u2010based approach, which holds potential applications extending to traditional Chinese acupuncture. This experimental study, conducted with 180 healthy adult participants, investigates the effects of microneedle\u2010assisted taVNS on motivation and effort through pupillometry. Participants underwent taVNS using both microneedles and adhesive electrodes. Key physiological metrics\u2010pupil size, heart rate, and blood oxygen levels\u2010alongside cognitive metrics such as reaction time and error rates in a computer game, are assessed. Results reveal that microneedle\u2010assisted taVNS significantly enhanced all measured parameters, attributed to its precise and consistent stimulation of the auricular branch of the vagus nerve. 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