Fig. 5: Neural results: a priori higher-level pain processing ROIs.

The mean signal across all voxels of each a priori ROI across participants are presented, in the Control (red) and Placebo (blue) condition, for each combination of modality and stimulus level. Error bars represent within-participant standard error of the mean, based on Morey, 2008107. Nā=ā392 participants. Asterisks represent significance of the placebo effect (mixed-effects model, uncorrected): *pā<ā0.05, **pā<ā0.01, ***pā<ā0.001. For additional visualizations see Supplementary Fig.Ā 7. L left, R right, dlPFC dorsolateral prefrontal cortex, OFC orbitofrontal cortex, NAc nucleus accumbens.