Partial Pearson’s correlation of R2* in regions identified by models to improve the prediction of executive function and attention outcomes. For executive function, the regions were a) caudate, b) subthalamic nucleus (STN), c) substantia nigra pars compacta (SNc), and d) hippocampus. For attention the region was e) the putamen. The covariates were the significant clinical predictors from the models, which were age and disease duration for executive function and age, sex, disease duration and pre-DBS test score for attention