Transauricular Vagal Nerve Stimulation; Functional Dyspepsia and Gastroparesis

Inclusion Criteria: 1. Male or female. 2. Age 18-85 years. 3. Healthy volunteer or established diagnosis of idiopathic, diabetic, or postsurgical gastroparesis and functional dyspepsia. 4. Patient is capable of giving informed consent. 5. Patient is on stable doses of other medications for gastroparesis or functional dyspepsia for preceding 4 weeks prior to enrollment (including cholinergics, anti-cholinergics, dopamine and serotonin receptor agonists/antagonists, motility agents, neuromodulators, herbals). Exclusion Criteria: 1. Any diagnosis of systemic autonomic dysfunction. 2. Use of narcotic, anticholinergic, cholinergic, or promotility medications in preceding 2 weeks of study. 3. Enteric feeding tubes. 4. Parenteral nutrition. 5. Severe disease flare requiring hospitalization or ER visits within 3 months of study. 6. Untreated depression or suicidal thoughts. 7. Pregnant/breastfeeding women. 8. History of gastric pacemaker implantation. 9. Implantable electronic devices (i.e. cardiac pacemakers) 10. Extrinsic myopathy/neuropathy 11. Vagal nerve injury. 12. High risk cardiac arrhythmias (high grade AV block, atrial fibrillation, atrial flutter). 13. GERD. 14. History of dumping syndrome. 15. History of rapid gastric emptying. 16. Severe allergy to skin adhesives. 17. Concurrent enrollment in other clinical trials.