ABVN Phase 2-Studying the Effect of Stimulation on the Auricular Branch of the Vagal Nerve

Inclusion Criteria healthy volunteers * Healthy volunteers with no gastric symptoms or conditions (except due to COVID 19) * Aged 18-80 years * Willing to have electrodes placed in the external ear (ABVN arm) * Willing to perform vagal activity maneuver (Vagal arm) * Willing to have 1 tablespoon (15 ml) of blood drawn at 3 time points Inclusion Criteria gastroparesis subjects * Gastroparesis subjects with a confirmed diagnosis of gastroparesis from a GI physician * Have a formal diagnosis of gastroparesis or are seeing the GI physician for symptoms related to gastroparesis * Aged 18-80 years * Willing to have electrodes placed in the external ear (ABVN arm) * Willing to perform vagal activity maneuver (Vagal arm) * Willing to have 1 tablespoon (15 ml) of blood drawn at 3 time points Exclusion Criteria: * Unable to provide consent * Pregnant females * Prisoners