fMRI linear mixed effects results for the group (OSU, CS) main effect (n = 208).

For all regions of interest identified, CS showed stronger activations than OSU. Cluster significance of p < .05 corrected for multiple comparisons (voxel-wise probability: p < .05, F1,156 = 3.89). Abbreviations: R, right; L, left; x, y and z: Brodmann Area (BA) coordinates; OSU, occasional stimulant users; CS, stimulant naïve comparison subjects; BA, Brodmann Area; SFG, superior frontal gyrus; DLPFC, dorsolateral prefrontal cortex. 1 Whole brain analysis. 2 Risk mask analysis. fMRI linear mixed effects results for the group (OSU, CS) main effect (n = 208).