Traumatic Brain Injury in Parkinson’s Disease Study: This longitudinal observational study is investigating the impact of mild to moderate traumatic brain injury on quality of life, mood, and cognition individuals with Parkinson’s disease. The study duration is approximately 2 years and involves cognitive pencil and paper testing sessions and possibly an MRI scan. Only two in-person visits are required two years apart. Individuals do not need to have a history of TBI to enroll. Currently, this study is only enrolling Veterans. For more information and to enroll, please see the link below or call 858-552-8585 ext. 5593.