Learning Mechanisms for Placebo and Nocebo Studies on Somatosensory Sensations: a Systematic Review and Meta-analysis.

The placebo interventions of interest are experimental learning methods (e.g. verbal suggestion, conditioning), used to induce placebo effects on somatosensory sensations.

Placebo and nocebo effects should be measured relative to a control group (between-subjects design). In the case of within-subjects designs, these will be included to the extent possible (in a separate analysis or descriptively depending on the number of results).

The nocebo interventions of interest are experimental learning methods (e.g. verbal suggestion, conditioning), used to induce nocebo effects on somatosensory sensations.