Regions of interest. A) Striatum (Str) (subdivided into caudate (Caud), putamen (Put) and globus pallidus (GP) on different colors on the left side). B) Habenula region of interest was one 3×3×3 cube on each side, manually located using the T1 and functional images as guide. C), D), E) Exploratory ROIs: C) superior, medial, inferior frontal gyri (s, m, i), insula (Ins), anterior cingulate cortex (ACC); D) nucleus accumbens (nAcc), amygdala (Amy); E) Septum verum (SV), Locus coeruleus (LC).