Table 2.
Results using a parametric model for analysis of the fMRI data
| Area | L/R | x | y | z | Z score | Number of voxels, p < 0.005 | Corrected p value |
|---|---|---|---|---|---|---|---|
| Offer amount: main effect across all trial types | |||||||
| Postcentral gyrus | R | 39 | −30 | 45 | 4.91 | 536 | <0.001 |
| 33 | −33 | 36 | 4.16 | ||||
| SMA and pre-SMA | L | −9 | 3 | 51 | 4.41 | ||
| Offer amount: interaction with social context (M-in-H > M-in-L) | |||||||
| MFG | R | 30 | 45 | 18 | 4.44 | 113 | 0.006 |
| Inequality: negative main effect across all trial types | |||||||
| Posterior insula | R | 33 | −21 | 21 | 3.73 | 114 | 0.006 |
| 42 | −24 | 24 | 3.43 | ||||
| IPC | R | 54 | −18 | 30 | 3.38 | ||
| Inequality: negative main effect, matched trials (M-in-H and M-in-L) | |||||||
| Posterior insula/STG | L | −45 | −18 | 0 | 3.87 | 80 | 0.043 |
| −36 | −12 | 3 | 3.25 | ||||
| −54 | −12 | 6 | 3.24 | ||||
| STS/MTG | R | 66 | −33 | −6 | 3.55 | 137 | 0.002 |
| 57 | −30 | 6 | 3.49 | ||||
| 63 | −12 | 0 | 3.36 | ||||
| Inequality: interaction with social context (M-in-L > M-in-H) | |||||||
| Mid-insula/rolandic operculum | R | 48 | −3 | 9 | 5.05 | 728 | <0.001 |
| 36 | 6 | 9 | 4.12 | ||||
| Precentral gyrus | R | 60 | 3 | 18 | 4.00 | ||
| MCC | L | −12 | −6 | 39 | 4.46 | 135 | 0.002 |
| SMA/MCC | R | 9 | −27 | 51 | 3.89 | ||
| 9 | −3 | 45 | 3.45 | ||||
| Supramarginal gyrus | L | −51 | −27 | 27 | 4.38 | 512 | <0.001 |
| Mid-insula/rolandic operculum | L | −48 | −9 | 12 | 3.93 | ||
| Precentral gyrus | L | −60 | 0 | 9 | 3.91 | ||
This table shows all activation that survived cluster-level correction (p < 0.05 FWE corrected; threshold of p < 0.005 used to define the clusters) for the following contrasts: main effects of offer amount (collapsed across all trials; M, L, and H); main effects of inequality orthogonalized with respect to offer amount (first, collapsed across all trials and second, collapsed across the matched M-in-L and M-in-H trials); and the effects of context (M-in-L vs M-in-H) on each of these parametric regressors. For each cluster, the following are shown: the three constituent peaks with the highest Z-scores; the number of voxels at p < 0.005 (uncorrected); and the p value of the cluster after FWE correction across the whole brain. SMA, Supplementary motor area; SFG, superior frontal gyrus; MFG, middle frontal gyrus; MCC, middle cingulate cortex; STS, superior temporal sulcus; MTG, middle temporal gyrus; STG, superior temporal gyrus; L, left; R, right.