The Study
The Influence of Placebo Analgesia Manipulations on Pain Report, the Nociceptive Flexion Reflex, and Autonomic Responses to Pain.
This is a medical experiment where researchers randomly split 133 people into 4 groups to test different fake pain treatments (placebos). Because they randomly chose who got which treatment, this is one of the best types of studies for showing cause-and-effect. However, we only have the summary (abstract), not the full details, so we can't check if the study was done perfectly. The study shows that combining expectations with conditioning worked best for reducing pain, but the results should be treated as 'suggestions' rather than absolute proof.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Researchers tested whether telling someone they will feel less pain (expectation) or making them feel less pain through repeated exposure (conditioning) actually changes how their body processes pain signals.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 540 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1The study shows that simply expecting pain relief doesn't work as well as combining expectations with conditioning - but both affect the body in complex ways that aren't fully understood.
- 2133 people received electric shocks after a fake cream was applied.
- 3Only people who had both expectations AND conditioning felt less pain and had less skin response.
- 4But their spinal reflex actually increased! People with only expectations had the same increased spinal reflex but didn't feel less pain.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The journal of pain : official journal of the American Pain Society
Year
2018
Authors
J. Rhudy, Y. Güereca, B. Kuhn, S. Palit, M. Flaten
Related Content
Claims (6)
When people get treatment for pain, sometimes they feel better just because they expect to feel better - not because the treatment actually changed anything in their body.
When researchers tell people a pain treatment will work but don't actually give them any real treatment, it seems to make their automatic pain reflex stronger, but doesn't change how much pain they report feeling or how their body reacts to pain.
A fake pain treatment that only uses learned associations from past experiences doesn't actually change how much pain people feel or how their body automatically reacts to pain.
Scientists found that when you combine expecting pain relief with a learning process (like getting a fake treatment that works like real medicine), it's the only way to actually reduce both how much pain people feel and their body's stress response to pain from electric shocks.
When people expect a pain treatment to work (even if it's just a fake treatment), they often feel less pain - but a new study shows their spinal cord's response to pain signals actually gets stronger, not weaker.
When people expect pain relief and have prior experience with effective treatments, their brains appear to activate two opposite nerve pathways - one that actually makes the spinal nerves more sensitive, and another that helps them feel less pain consciously.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.