Table 4. In regions of a priori interest, as well as in functional ROIs, evidence was found that the same activation took place in depression and control groups.

The only exception was the bilateral supplementary motor area, where there was evidence for greater activation in the depression group upon action emission as contrasted with action withholding.

Key Regions of Interest	Bayes Factor (Scaled JZS)	t value	uncorr. p
Action Emission > Action Withholding during anticipation (functional ROIs)	> 1 is in support of no difference between Depression and Healthy groups
Midbrain	1.59	-1.40	0.17
Supplementary Motor Area (bilat.)	0.53	-2.17	0.034
Left Caudate	3.50	-0.15	0.88
Right Caudate	3.27	-0.43	0.67
ROIs of interest a priori (structural)
SN/VTA	1.48	-1.46	0.15
Ventral Striatum	3.03	-0.61	0.54
Action Withholding > Action Emission during anticipation (functional ROIs)
Left Parieto-Occipital	3.52	0.078	0.94
Left Amygdalo-Hippocampal	3.41	-0.29	0.77
Right Amygdalo-Hippocampal	3.31	-0.39	0.69
ROIs of interest a priori (structural)
SN/VTA	3.46	0.21	0.82
Ventral Striatum	3.48	0.18	0.85
Better > Worse than expected reward prediction error (funct. ROI)
ventromedial PFC	3.47	0.20	0.84
Worse > Better than expected reward prediction error (funct. ROI)
right insula	2.63	0.85	0.40
left insula	3.47	0.20	0.84