Figure 5.

Parametric analysis results. Left top, Regions in which activity was predicted by a parametric regressor of distance from the decision bound (illustrated in Fig. 1, top right). Note increased activity in the superior parietal, medial occipital and lingual gyrus, putamen, and anterior hippocampus. Slices from left to right are at z = 63, 8, and −16. Left bottom, Negative distance from decision bound, i.e., higher activity for closer to the bound. Slices from left to right are at x = 7, z = 5, and y = 23. Note the salience network activity (bilateral frontoinsular and medial frontal cortices), plus midbrain and thalamic activity. Right, Regions in which activity was predicted by a parametric regressor of distance from the prototype (central stimulus in the training region; illustrated in Fig. 1, bottom right). Note the activity in the inferior parietal lobe; slices are at z = 49 and y = −46. No regions were significantly predicted by the negative distance from the prototype, i.e., close to the prototype.