This study investigates the relationship between brain activities and the symptoms of Parkinson's disease when neurofeedback training is applied. Parkinson's disease is a condition that affects the nervous system and causes symptoms such as tremors, stiffness, and difficulty with balance and coordination. Neurofeedback is a type of therapy that uses real-time displays of brain activity to teach self-regulation of brain function.

Participants in the study will undergo neurofeedback training sessions. These sessions involve monitoring brain activity and providing feedback to help participants learn how to control certain aspects of their brain function. The study aims to observe changes in brain activity and any corresponding changes in the symptoms of Parkinson's disease.

• Who can participate: Adults over 20 with Parkinson's disease or healthy individuals who have consented can participate. Participants must not have severe illnesses, implantable devices like pacemakers, or conditions that prevent them from performing study tasks.
• Study details: Participants will engage in sessions to learn to regulate their brain activity through real-time feedback. The study will compare changes in brain activity with changes in symptoms of Parkinson's disease.