The relation between visual hallucinations and visual evoked potential in Parkinson disease.
OBJECTIVE: The pathophysiology of hallucinations in Parkinson disease is poorly understood. This study investigated the relation between visual hallucination and visual evoked potentials (VEPs) in Parkinson disease. METHODS: Nineteen patients with Parkinson disease were studied. The authors divided patients into 2 groups: patients with visual hallucinations (VH group) and those without visual hallucinations (no-VH group). VEPs using a checkerboard stimulus were recorded under a drug-free state. RESULTS: On multivariate regression analysis, only the average P100 latency was selected and remained significant after the backward elimination method. CONCLUSION: The authors demonstrated a close association between visual hallucinations and elongated VEP latency in Parkinson disease. VEPs may become one of the predictors for visual hallucination.