“Some common personality traits — such as ambition and rigidity — have been noted in people with Parkinson's disease. Many experts on Parkinson's, including spouses of those with the condition, believe that people with the condition develop certain distinctive personality traits and that these traits appear long before the onset of the physical symptoms of Parkinson's.”
Parkinson's Personality: Disease More Likely to Strike Cautious People
CHANGES IN PERSONALITY
The idea that a disease could cause even modest changes in who we are makes many of us uncomfortable. However, there is no question that the brain is changing because of Parkinson’s.
A Link Between Personality Type and Risk for Parkinson's Disease?
Personality and addictive behaviours in early Parkinson's disease and REM sleep behaviour disorder