Fig 3. Selected results from the computational model.

For each coefficient the left plot shows the group posterior distribution for healthy controls (HC) and individuals with major depressive disorder (MDD). The right plot shows the posterior distribution of difference as a measure of the effect of group on each coefficient, and the probability given data that the coefficient is higher in HC than MDD. a, weight of aversiveness onto drift rate (v), b, weight of reward onto drift rate (v), c, estimated relative starting point (z) between decision thresholds, d, impact of Pavlovian effect onto starting point (z), e, impact of activity in nucleus accumbens (NAcc) onto starting point (z), f, impact of activity in the pACC onto drift rate (v). For the entire set of coefficients see Table 1.