Figure 3

Intra-dyad correlations (IDC). Brain images illustrate greater IDC in the PR compared with the PP condition (PRIDC > PPIDC; pFWE < 0.05) in the right anterior insula (AI; left) and anterior midcingulate cortex (aMCC; right). The scatter plot shows that greater IDC in the PR condition was correlated positively with Proposer reciprocity estimates (αProp.).