This study is about understanding the subthalamic nucleus (STN), a part of the brain that helps control movement, in people with Parkinson's disease (PD) and healthy people. Parkinson's disease is a disorder that affects movement, causing symptoms like shaking and stiffness. Akinesia means difficulty in starting movement. The study looks at how problems with the STN cause akinesia and how stimulating the STN can help with movement in PD patients.

Eligibility for participants includes:

• Age between 18 and 70 years
• Must have social health insurance
• Voluntary agreement to participate (sign a consent form)

Some criteria to be aware of:

• People with certain medical conditions or those taking specific medications might not be eligible.
• No compensation is mentioned for participation.
• Participants may need to undergo tests like MRI, which is a scan that uses magnets to take pictures of the brain.