Table 2.

BOLD responses to contrasts of interest

Brain regions	Brodmann area of local maxima	Hemisphere	Voxel number	Voxel t score	Montreal Neurological Institute brain template coordinates of local maxima
Responses to low second-order uncertainty (i.e. entropy) within ambiguous gambles
Posterior cingulate, superior parietal lobule, postcentral gyrus, parahippocampal gyrus, precuneus, middle temporal gyrus, angular gyrus, superior & middle occipital gyrus	30 and 31	Bilateral	5383	7.67	16, −58, 6; −20, −62, 8; 18, −66, 24
Superior parietal lobule, precuneus, angular gyrus	7	Left	193	5.05	−18, −54, 54
Ambiguous > nonambiguous gambles
Precuneus, superior and inferior parietal lobule, postcentral gyrus	7	Left	516	5.6	−16, −54, 46; −22, −54, 52; −10, −62, 56
Ambiguous > non-ambiguous gambles: correlation with individual measures of ambiguity aversion
Inferior frontal gyrus*	47	Right	61	5.21	44, 32, 2
Low > high probability range within ambiguous gambles
Middle frontal gyrus*	45 and 46	Left	63	4.58	−40, 36, 16; −34, 28, 12
First-order probability (nonambiguous gambles)†
Inferior parietal lobule, supramarginal gyrus, angular gyrus	40 and 39	Right	404	6.77	44, −44, 32; 38, −50, 26; 48, −64, 34
Superior and middle frontal gyrus	9 and 8	Left	154	5.78	−22, 30, 36; −28, 26, 40; −28, 18, 48
Middle frontal gyrus	9	Right	126	5.22	38, 22, 42

All clusters are reported as cluster level corrected with p < 0.05 for familywise error. Additional clusters from regions of interest are reported at a voxel-level significance threshold of p < 0.001, small volume corrected with p < 0.05 for familywise error in regions of interest for a sphere with 15 mm radius around peak coordinates as reported by Bach et al. (2009) and Huettel et al. (2006) (marked with *). No significant BOLD responses were observed for any other contrast of interest.

^†Note that in nonambiguous trials, normalized shock probability equals normalized expected value, or utility, as value/utility was not varied throughout the experiment.