an application subsystem comprising an electrode in direct contact with a user and positioned to stimulate an auricular branch of the vagus nerve of the user using electrical stimulation, the coupling of the electrode to the user performed outside of a surgical setting;

a signal subsystem comprising a waveform generator comprising a microcontroller, the waveform generator communicatively coupled to an amplifier, the amplifier communicatively coupled to the electrode of the application subsystem and configured to amplify a waveform generated by the waveform generator, the waveform being square and biphasic;

a triggering subsystem comprising a receiver configured to detect the presence of a tag within a threshold distance, the triggering subsystem communicatively coupled to the signal subsystem and configured to automatically trigger the generation and amplification of the waveform by the signal subsystem upon detecting the presence of the tag within the threshold distance, the waveform driving the electrode of the application subsystem to stimulate the vagus nerve of the user; and

a wearable casing through which at least the signal subsystem and the triggering subsystem are coupled to the user;

wherein the tag is an RFID tag located proximate a rehabilitation context such that the tag is within the threshold distance from the triggering subsystem when the user is using the rehabilitation context for rehabilitation training, resulting in the vagus nerve of the user being automatically stimulated by the application subsystem in response to the user's rehabilitation training;

wherein the rehabilitation context is one of a rehabilitation location and a rehabilitation equipment.