Pain modulation in VAS ratings predicted by prediction errors for each condition.
pain
REGRESSION
Regression lines indicate prediction from the mixed effects model with predictors ‘PE’, ‘drug’, and their interaction (placebo: n=28, levodopa: n=27, naltrexone: n=28).The effect of prediction errors on pain modulation showed a significant interaction with the drug condition (Estimated prediction errors also showed a significant main effect for the prediction of behaviorally assessed pain modulation (