This study explores how a special treatment called transcutaneous auricular vagus nerve stimulation (taVNS) might help with movement problems in people with Parkinson's Disease (PD). PD is a brain disorder that affects movement, causing tremors or stiffness. In this study, participants will receive taVNS treatment, which involves using small devices that send gentle electric signals to the ear, for 30 minutes, twice a day, over 14 days. There is also a sham group where participants will undergo a similar procedure without the active treatment. The study aims to see if taVNS can improve movement by checking brain activity with tests like Functional near-infrared spectroscopy and Transcranial magnetic stimulation. To join, participants must be aged 40 to 80, have stable PD medication, and be able to cooperate with the study requirements.

• The study lasts for 14 days with daily visits.
• Participants will undergo brain activity tests twice.
• No compensation is mentioned, but participation may help understand PD better.