Fig. 6: Correlations between behavioral and neural placebo-induced reductions.

Placebo-induced neural reductions (Control - Placebo) in the (A) NPS or (B) SIIPS, as a function of the behavioral analgesia (pain ratings Control - Placebo) for each stimulus intensity level (color) and modality. Each dot is a participant. Lines represent linear smoother, with the 95% confidence interval shaded in gray. Asterisks represent significance of the correlation (mixed-effects model, uncorrected): *pā<ā0.05, **pā<ā0.01, ***pā<ā0.001 (Thermal: Nā=ā367 participants; Mechanical: Nā=ā368 participants).