(a, c) SPM showing effects of estimation uncertainty at time of cue at intraparietal sulcus [IPS; peak at x,y,z = -42,-40,52], bilateral middle occipital gyrus [MOG; peak at x,y,z = 38,-88,6], striatum [St; peak at x,y,z = 8,-2,12], bilateral middle frontal gyrus [MFG; peaks at x,y,z = -34,58,10; x,y,z=-52,10,38; x,y,z = 48,36,24; x,y,z = 30,-4,64], anterior cingulate [AC; peak at x,y,z = 0,10,54] and inferior frontal gyrus [x,y,z = 48,18,-4]; pFWE < 0.05 after extent thresholding. Activation increased linearly in estimation uncertainty at all regions, with the exception of a cluster at right MFG [x,y,z = 30,-4,64]. (b) Bar plot shows the average effect of low, medium and high estimation uncertainty at anterior cingulate. To generate these plots, trials were sorted according to their estimation uncertainty value into one of three equal-sized bins, which were then fitted to the BOLD signal. Error bars indicate SEM.