taVNS in Mild to Moderate Parkinson's Disease

Patients will be masked to transcutaneous stimulation of the auricular branch of the vagus nerve at the tragus

Sham stimulation involves identical perceptual threshold finding and stimulation parameters as active stimulation, with the exception of stimulation target. Sham stimulation will be delivered to the left earlobe, a target believed to have little to no vagal nerve innervation.