SPM of brain activity for cue presentation. SPM of brain activity for cue presentation. Fractal images indicating high effort elicited greater activity in supplementary motor area (SMA), anterior cingulate cortex (ACC), and dorsal striatum (dorsal putamen) than fractal images indicating low effort did (p < 0.05 FWE; whole brain, SVC within bilateral ACC ROI, SVC within bilateral striatum ROI, respectively). Coordinates are given in MNI space. L indicates left; R, right. For illustrative purposes, voxels displayed in gray on glass brain and in yellow on slices survived a threshold of p < 0.001, uncorrected. Irma T. Kurniawan et al. J. Neurosci. 2013;33:6160-6169 ©2013 by Society for Neuroscience