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Areas showing a significant main effect of operant responding (p < 0.001; p < 0.05 corrected): a) Left inferior parietal lobule (BA 40); b) Medial frontal/cingulate gyrus (BA 24); c) Right postcentral gyrus (BA 5); d) Bilateral caudate. Activity was significantly greater across response-with-distracter conditions than image-only conditions.
