<p>Supplementary material.</p>

<p>Single supporting file containing Figs A-I and Tables A-C, labeled as follows. <b>Fig A</b>, model predictions using posterior predictive checks for the PADDL and choice-only softmax models (HC group). <b>Fig B</b>, model predictions using posterior predictive checks for the PADDL model without the RL contribution (HC group). <b>Fig C</b>, out-of-sample validation of estimated parameters on the held-out test phase (SCZ group). <b>Fig D</b>, posterior predictive checks for the BP and MDD groups. <b>Fig E</b>, group-level posterior distributions across all clinical groups. <b>Fig F</b>, parameter recovery for the joint (PADDL) and choice-only (softmax) models. <b>Fig G</b>, comparison of empirical and simulated RT distributions. <b>Fig H</b>, VI loss as a function of iterations for multiple seeds, with convergence checks. <b>Fig I</b>, posterior pair plots for the group-level parameters. <b>Table A</b>, summary of posterior parameter estimates across all groups. <b>Table B</b>, summary of contrasts across all groups. <b>Table C</b>, demographic information about the groups.</p> <p>(PDF)</p>