My wife’s aunt died due to Parkinson’s disease. Before her death, her fingers and toes were twisted. Soon after her death, the twists disappeared and the fingers and toes became normal in her dead body.
My explanation for this observation is as follows. The state of her mind was causing the twists by giving control signals from the brain. When she died, the mind ceased. With that control of her twists were stopped. And that led to disappearance of twists.
My view is the mind’s state causes symptoms of PD. When I am peaceful, my tremors stop, and rigidity reduces. I also experience tremors stop when I detach from the body, and get into soul consciousness.
When I am in anxiety, I find that hand tremors increase. The rigidity also increases.
Parkinsons recovery on untrodden path 