(A) Activity in the vmPFC significantly correlated with preference for the chosen item at the time of decision. The vmPFC activation map is thresholded at p < 0.005 uncorrected for display purpose.
(B) Effect sizes of the preference in the independently identified vmPFC ROI. The effect sizes are plotted separately for the first, the second, and the later trials in each block (mean ± SEM across participants; n = 20). **p < 0.01, and n.s., non-significant as p > 0.05. Inset, activated voxels in response to the preference on the first trial (p < 0.005 uncorrected). vmPFC, ventromedial prefrontal cortex.
(C) Effect sizes of the preference in the vmPFC ROI for the main and the control experiment. Left, the main experiment; Right, the control experiment. The format is the same as panel B.