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I copied this para from the times article, could someone explain to me what exactly this means. What is "cognitive impairment" and what causes it, PD itself, or the medications
The disease progresses at different rates in different people, and there is no way to predict how quickly Ms. Reno's condition will deteriorate. About one-quarter to one-third of all patients have cognitive impairment, but DR. Weiner says there is no evidence of this in Ms. Reno.
Lanier Maddux