Woolie
Senior Member
Darragh, M., Chang, J. W.-H., Booth, R. J., & Consedine, N. S. (2015). The placebo effect in inflammatory skin reactions. Journal of Psychosomatic Research, 78(5), 489–494. doi:10.1016/j.jpsychores.2015.01.011
ResearchGate link here
Scihub link here
This study found that a placebo cream reduced self-reported itch relative to the same cream presented as an inert moisturiser. It did not find any direct benefits on measures of the size of the rash (weal size).
Another example suggesting that placebo effects tend to be limited to self-reported measures, and do not extend to objective measures.
Abstract:
ResearchGate link here
Scihub link here
This study found that a placebo cream reduced self-reported itch relative to the same cream presented as an inert moisturiser. It did not find any direct benefits on measures of the size of the rash (weal size).
Another example suggesting that placebo effects tend to be limited to self-reported measures, and do not extend to objective measures.
Abstract:
Purpose: To investigate suggestion-induced placebo effects in inflammatory skin reactions.
Methods: A healthy sample of volunteers (N = 48) attended two laboratory sessions. In each, a local short term inflammatory skin reaction was induced with histamine. Participants were told that one session was a control session and the other was a treatment session in which an antihistamine cream would be applied to the arm to reduce the size of the weal and the experience of itch. Inert aqueous cream was applied in both sessions. Participants were randomly allocated to undergo either the control or the treatment session first.
Results: The placebo manipulation successfully reduced self-reported itch from the control to the placebo treatment session, but no placebo effect was demonstrated in weal size. Order effects were observed such that only those who underwent control procedures first had a smaller weal in the placebo treatment session as compared to the control session. The same order effect was seen for reported itch at one minute post histamine administration, but this disappeared at the three andfive minute measures.
Conclusion: Findings suggest that explicit verbal suggestion can reduce the experience of itch. In addition to conscious awareness, a concrete representation of the suggested changes gained from prior experience to the stimulus may be an important component of placebo effects on inflammatory skin reactions.
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