Figure 8.

PPI Analyses Demonstrated vmPFC and dACC Interactions with PCC during Different Types of Decisions and the Relationship with IFG Activity

(A) Time course illustrating PPI between PCC and vmPFC as a function of decreasing risk bonus on trials when the safer option was taken. a.u., arbitrary units.

(B) Time course of PPI between PCC and dACC as a function of V_riskier − V_safer value difference on trials on which the riskier option was chosen (dotted line).

(C) Time course of a PPI on PCC, using the IFG signal and the different effects of vmPFC and dACC, the two regressors from (B) and (A), respectively.

(D) Illustration of effects in (A)–(C). The PCC couples with dACC and vmPFC during decisions in which the riskier option (red) and safer option (green) were taken, respectively. Left IFG may regulate PCC’s interactions with the vmPFC and dACC by increasing the relative degree of coupling to the former as opposed to the latter during riskier choices.

See also Figures S7 and S8.