A. Sagittal section of weaker activation in the left caudate nucleus (−12, −3, 24, T = 4.00, p <0.05 FDR corrected; −9, 0, 15. T = 4.00, p <0.05 FDR corrected) during milkshake receipt versus tasteless solution receipt as a function of BMI depending upon A1 allele status. The graph shows the parameter estimates of the contrast (milkshake receipt versus tasteless solution receipt) across BMI scores for each DRD2 allele type (Study 1). B. Coronal section of weaker activation in the left caudate nucleus (−9, 0, 24, T = 3.81, p <0.05 FDR corrected) during milkshake receipt versus tasteless solution receipt across BMI scores for each DRD2 allele type, with the graph showing the parameter estimates of the contrast (milkshake receipt versus tasteless solution receipt) versus BMI for each allele type (Study 2).