Parkinson's Disease (PD) is a condition that affects the brain and causes problems with movement and other symptoms. Some people with PD don't get better with medicine alone, so doctors use something called Deep Brain Stimulation (DBS). DBS is a treatment where electrodes are placed in certain areas of the brain to help with symptoms. However, DBS can sometimes cause mood changes, like mania, which is a state of very high energy and excitement. In this study, researchers are looking at why DBS might cause mania and if certain settings or locations in the brain are linked to this. They will use special brain images from people who have had DBS to study this further.

• The study uses past data and images from patients who had DBS.
• Participants must be 18 or older and have had DBS.
• People with mood issues before DBS cannot join the study.