Parkinson's disease patients often experience neuropsychiatric symptoms like cognitive issues, depression, and anxiety. A research team, including Binghamton University's Christopher R. Bishop, received a $3 million grant from the Department of Defense to study these symptoms. Their focus is on how serotonin-producing neurons, which can produce dopamine, contribute to these issues. The team aims to improve PD symptom management and has identified potential repurposed medications.