Figure 4.

A–D, BOLD responses to low second-order uncertainty (i.e., Shannon entropy of second-order probabilities) within ambiguous trials. E, Different responses were found for the contrast ambiguity vs nonambiguity (note that responses in the posterior parietal cortex, D and E, are high for ambiguity where entropy is higher than in nonambiguity, but also high for low entropy within ambiguous trials, suggesting that responses to ambiguity are not driven by entropy). F, Responses to ambiguity vs nonambiguity in right inferior frontal gyrus covaries with ambiguity aversion on a between-subject level. All contrasts are overlaid on an average normalized T1 image from the whole sample and are in neurological convention. Responses in A–E survive whole brain correction for familywise error at a cluster-level threshold of p < 0.05 and a voxel-level threshold of p < 0.001; responses in F are small volume corrected for familywise error at a voxel-level threshold of p < 0.05.