This dataset is associated with both a doctoral thesis and planned publications. The thesis is entitled “Cognition, Emotion Regulation, and Mental Health in Parkinson’s Disease” and is expected to be deposited at the University of Reading in 2026. In addition, the dataset underpins a series of manuscripts currently in preparation, including "Emotion regulation as a transdiagnostic mechanism of mental health in Parkinson’s disease: Linking alexithymia and apathy".