Figure 6

Activation in the caudate nucleus was correlated with expected reward. Activation of the caudate nucleus (14, 10, 8; FWE-corrected p = 0.029 for multiple comparisons across the whole brain; k = 13) was negatively correlated with relative income (r = −0.21, p = 0.019) when choosing an equality rule behind the VoI. Neural data were obtained from the contrast that subtracted the activation evident when drawing the lottery from that observed upon a redistributive decision. The relative income was calculated by dividing the participant’s total income by that of the partners. Total income was neither realized nor revealed until the end of the game; thus, the relative income was regarded as an expected reward.