Table 3.

Summary of the results for the parametric regressors at the time of the offer screen

Brain region	L/R	Voxels	Z−t	x	y	z
negPE-Whole-slab
Insula/IFG	R	24	−3.21	34	18	−7
variance PE-Whole-slab
Insulaa	R	93	3.07	34	18	−7
variance PE-ROI
SN/VTA (VTA)	L	10	3.29	−2	−13	−22

Clusters’ peak voxel coordinates in brainstem normalized Talairach space and Z−t statistics for analyses done with regressors onsets locked to the offer screen. t-values were transformed into Z-scores because the total number of participants that had data for specific voxels could change due to the use of individually defined acquisition slabs. Statistics were only calculated on voxels that had at least 20 participants. Whole-slab results survived FWE P < 0.05 corrected 31 voxels minimum cluster size (alpha of 0.005 at the voxel level). ROI results survived FWE P < 0.05 corrected six voxels minimum cluster size (alpha of 0.005 at the voxel level). L: left; R: right; IFG: inferior frontal gyrus; SN/VTA: substantia nigra/ventral tegmental area; ROI: region of interest; negPE: negative norm prediction error; variance PE: variance prediction error.

^aIndicate that these clusters were also significant at the cluster P < 0.05 with an alpha of 0.001 at the voxel level (minimum cluster size: 14 voxels for whole-slab; 3 voxels for ROI).