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Table 1 The list of inclusion and exclusion criteria

From: Pain rewarded: hyperalgesic and allodynic effect of operant conditioning in healthy humans—protocol for a systematic review and meta-analysis

Issue Inclusion criteria Exclusion criteria
P - Healthy controls
- Pain-free controls
- Information on any disease
I - Operant conditioning procedure - Classical conditioning studies
- Observational learning studies
- Other interventions combined with operant conditioning
C - No restriction
- Within-subject control
- Between-subject control
- No intervention
- Non-contingent learning
- No conditioning procedure
O - Pain measured on any pain scale N/A
S - Experimental studies
- Randomized controlled trials
- Published until 2018
- Conference proceedings
- Only abstracts available
  1. P participants, I intervention, C comparison, O outcome, S study type