Characterization and Progression of Minor Phenomena in Parkinson's Disease (PD)

Parkinson's disease psychosis encompasses a range of symptoms, including minor phenomena, frank hallucinations, and delusions. Minor phenomena include passage hallucinations (fleeting sense of a person, animal or object passing in the periphery), presence hallucinations (feeling of nearby presence), and illusions (misrepresentation of external stimuli). Some forms of PD psychosis may be progressive. The primary objective of this study is to: 1\) To determine the cumulative probability of developing hallucinations or delusions over time in individuals with PD minor phenomena followed for 36 months.