Boston University Apr 21 2026 For many individuals living with Parkinson's disease and those in its "prodromal" or early stages before movement impairment, there is a distressing gap between how they feel their brain is working and what clinical tests show. Patients often report, "I feel like my thinking is getting worse," only to be told their objective cognitive scores are perfectly normal. A new study led by experts at Boston University, published in the journal Neuropsychology, is the first