by Markos Poulopoulos, M.D. Introduction James Parkinson, in his pivotal work “An Essay on the Shaking Palsy” (published in 1817), was the first to recognize the condition that later was named after him. He defined it as “involuntary tremulous motion, with lessened muscular power, in parts not in action and even when supported; with a … Continue reading Psychosis in Parkinson disease