Group prediction accuracy of parameters from Model 2 and Model 3.
REGRESSION
Although Model 3 was the best model, Model 2 also showed closely comparable prediction values (mean correlation value = 0.885). The only difference between the two models is the utilization of separate Pavlovian bias parameters for reward and punishment. Consequently, we further compared Models 2 and 3 and investigated whether having two parameters for Pavlovian bias (as in Model 3) would aid in classifying tDCS group membership. By employing ridge logistic regression and leave-one-out cross-validation, we compared the classification accuracy of both models. Model 3 (AUC = 0.806) demonstrated enhanced classification accuracy in comparison to Model 2 (AUC = 0.710). Error bars indicate SEM.(TIFF)Click here for additional data file.