Parkinson's disease is a brain disorder that affects movement and thinking. It can cause problems with stopping actions, like when you have to stop at a "stop" sign. This study explores if a gentle electrical stimulation, called **transcranial alternating current stimulation**, can help improve these thinking problems. It involves a mild, painless electric current applied to the scalp using small pads called electrodes. The study wants to see if this method can help patients stop actions better by measuring brain activity and reaction times on a computer task.

• The study involves 50 patients and 40 healthy people.
• Participants must be between 18 and 75 years old.
• Excludes those with severe mental disorders or drug issues.

This study is important for understanding new ways to help people with Parkinson's without using drugs. Participation requires consent and meeting the eligibility criteria. It is a safe, non-invasive method that could lead to better treatments for cognitive issues in Parkinson's disease.