Figure 3
DLPFC-IFG and DMPFC-IFG interactions increase with truthtelling costs particularly in individuals with stronger honesty-related values.
Functional connectivity between the honesty-related seed regions DLPFC and DMPFC (shown at smaller scale) and the IFG (DLPFC-IFG: −46, 28, 30; t(30) = 4.56; DMPFC-IFG: −44, 28, 28; t(30) = 5.12; both p < 0.05, whole-brain FWE cluster-level corrected) was increased in high compared to low cost conditions as honesty-related values increased. Voxels in red show correlation with the DLPFC seed, voxels in blue show correlation with the DMPFC seed, and voxels in purple show the overlap between the correlations of the two seed regions. The left graph shows individual connectivity strengths for the DLPFC-IFG interaction and the right graph shows individual connectivity strengths for the DMPFC-IFG interaction. Please note that this figure illustrates the results of a PPI analysis over all subjects. The y-axis shows the coupling difference for high-low cost conditions and the negative values in low honesty value individuals are a consequence of this fact. In other words, for these individuals coupling is higher for low cost than high cost conditions. However, in all conditions, coupling tended to be positive (Supplementary Fig. S4).
