This study looks at how well a new treatment, called transcranial direct current stimulation (tDCS), helps with swallowing problems in people with Parkinson's disease (PD). Dysphagia is a medical term for difficulty in swallowing. Participants are randomly placed into two groups: control (receiving a fake tDCS and usual treatment) and experimental (receiving real tDCS along with usual treatment).

Tests will occur before treatment starts, after it ends, and three months later. Doctors will use special X-ray tests, known as videofluoroscopic swallowing study (VFSS), and scales to study swallowing improvements. They will also look at brain changes using special scans, like functional magnetic resonance imaging (fMRI) or functional near-infrared spectroscopy (fNIRS).

• The study involves multiple visits: before treatment, after treatment, and a 3-month follow-up.
• Participants may experience the benefits of improved swallowing.
• There might be risks related to tDCS, though it is generally considered safe.