Lewy Body Disease (LBD) is a disorder that affects the brain and can cause problems with thinking and behavior. It can be hard to diagnose, and scientists are still trying to understand it better. This study aims to check if certain changes in brain activity are linked to LBD. To do this, researchers use a test called an EEG (Electroencephalogram), which measures brain waves. Participants in this study should be adults who had a specific test called RT-QuIC and an EEG between 2012 and 2020.

• Participants must be 18 years or older.
• The study is for those who have already been part of a related cohort.
• Participants should have had an EEG test during the specified period.

The study will help scientists better understand LBD by exploring brain activity in detail. This could lead to better ways to diagnose and treat the disease in the future. Participation involves consenting to the study and having previous EEG and specific analyses. There are no details on compensation or risks mentioned here, so consider this when deciding to participate.