This study is exploring new ways to diagnose Parkinson's Disease (PD) and related conditions using technology and a medicine test called an acute levodopa challenge test. This test helps doctors see how your body reacts to a medicine called levodopa, which is often used to treat PD. The study aims to find new signs, called digital biomarkers, that can help diagnose these conditions earlier and more accurately.

• The study is for people aged 50-75 with PD or similar conditions.
• Participants must agree to tests and evaluations related to the study.
• People with severe organ failure or mental disorders may not be able to join.

To join, you need to be diagnosed with PD or a related condition and be able to handle the levodopa test. If you have serious health issues, like heart or liver problems, or trouble understanding or signing forms, this study might not be for you. Participants are expected to sign a consent form to join the study. This is a voluntary study, and participation is entirely up to you.