GSTM1 and Parkinson disease: In this study, we aimed to investigate (a) whole brain functional connectivity, (b) the functional connectivity between the Hb and the whole brain, and (c) the relationship between connectivity changes and clinical features in early-stage PD patients compared to healthy controls (HCs) using ultra-high field 7 T fMRI data from the longitudinal observational TRACK-PD study designed to investigate functional and structural brain changes in early-stage PD24.