Table S3.

Categorical analysis of the outcome

		Peak voxel
Brain region	L/R	x	y	z	k	t	z
Prosocial outcome > self + no one outcome
Parahippocampul gyrus	L	−39	−51	−6	132	4.25	4.05
Fusiform gyrus	L	−46	−46	−6		3.42	3.3
Inferior temporal gyrus	L	−38	−60	−5		3.41	3.3
Posterior cingulate	R	15	−43	30	101	4.22	4.02
	R	15	−34	31		3.96	3.79
Inferior parietal lobe	R	45	−49	28	127	4.18	3.98
Midbrain	L	−4	−27	1	618	4.15	3.96
	L	−4	−16	12		3.95	3.78
	R	8	−19	12		3.83	3.68
Middle temporal gyrus	R	51	4	−30	108	4.11	3.92
Self outcome > prosocial + no one outcome
No voxels

Note that parametric analyses incorporating prediction errors allow a more precise estimation of how brain activity fluctuates during learning compared with examining outcome-associated activation alone. Parametric regressors are orthogonal to the events (in this case, outcomes) that they modulate. The relevant contrasts for the categorical analyses of outcome across conditions are presented below. Due to covariance between cues and outcomes in the categorical analysis these results should be interpreted with caution. For all regions, P < 0.001 voxel-level uncorrected, extent threshold k = 100. No regions survived voxel-level whole brain correction. L, left; R, right.