SPM correlation maps between the changes in D2R availability in putamen and the changes in activation/deactivation BOLD (SD vs. RW) and histograms showing the activation/deactivation responses to the 3 difficulty levels (2 balls, 3 ball, 4 balls) during RW and SD and the corresponding regression plots between putamen ΔD2R and ΔBOLD (averaged across the 3 difficulty levels). Significance for SPM maps correspond to p<0.005 not corrected. Abbreviations correspond to CG cingulate gyrus, LO = lower occipital, MO = middle occipital, CB = cerebellum, 2b = 2 balls, 3b = 3 balls, and 4b = 4 balls.