Explain how the reduction in dopaminergic signaling that could precede the development of motor symptoms in pd could explain the "parkinsonian personality

People with Parkinson’s disease often times develop certain personality characteristics which can be linked to the reduction of dopamine transmitters in their nervous system. This causes problems in motor movements. As a result, this group of people commonly have traits such as being passive, rigid, orderly, persistent and novelty-seeking. 

Personalities who are suffering from Parkinson’s disease usually exhibit specific character traits which can be associated with the loss of dopamine transmitters in their neurotic system. Such a loss creates problems in movements of the motor. In short such people generally have features like remaining submissive, firm, arranged, determined and originality-seeking.