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Induction of nocebo and placebo effects on itch and pain by verbal suggestions.
Pain 2011; 152(7):1486-94PAIN

Abstract

Physical complaints, such as pain, can be effectively reduced by placebo effects through induction of positive expectations, or increased by nocebo effects through induction of negative expectations. In the present study, verbally induced nocebo and placebo effects on itch were experimentally investigated for the first time. In part 1, the role of verbal suggestions in inducing nocebo effects on itch and pain was investigated. All subjects received the same somatosensory quantitative sensory testing stimuli, that is, mechanical and electrical stimuli and application of histamine, and verbal suggestions to manipulate expectations regarding the stimuli. The suggestions were designed to produce either high expectations for itch (itch nocebo) or pain (pain nocebo) or low expectations for itch (itch nocebo control) or pain (pain nocebo control). Results showed that high itch and pain expectations resulted in higher levels of itch and pain, respectively. When comparing nocebo effects, induced by verbal suggestions, results were more pronounced for itch than for pain. In part 2, verbal suggestions designed to produce a placebo effect on itch (itch placebo) or pain (pain placebo), or neutral suggestions (itch placebo control and pain placebo control) were given regarding a second application of histamine and compared with the first application applied in part 1. Results of placebo effects only showed a significantly larger decrease in itch in the itch placebo condition than in the pain placebo condition. In conclusion, we showed for the first time that nocebo and possibly placebo responses can be induced on itch by verbal suggestions.

Authors+Show Affiliations

Department of Medical Psychology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. a.vanlaarhoven@mps.umcn.nlNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

21353388

Citation

van Laarhoven, Antoinette I M., et al. "Induction of Nocebo and Placebo Effects On Itch and Pain By Verbal Suggestions." Pain, vol. 152, no. 7, 2011, pp. 1486-94.
van Laarhoven AI, Vogelaar ML, Wilder-Smith OH, et al. Induction of nocebo and placebo effects on itch and pain by verbal suggestions. Pain. 2011;152(7):1486-94.
van Laarhoven, A. I., Vogelaar, M. L., Wilder-Smith, O. H., van Riel, P. L., van de Kerkhof, P. C., Kraaimaat, F. W., & Evers, A. W. (2011). Induction of nocebo and placebo effects on itch and pain by verbal suggestions. Pain, 152(7), pp. 1486-94. doi:10.1016/j.pain.2011.01.043.
van Laarhoven AI, et al. Induction of Nocebo and Placebo Effects On Itch and Pain By Verbal Suggestions. Pain. 2011;152(7):1486-94. PubMed PMID: 21353388.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Induction of nocebo and placebo effects on itch and pain by verbal suggestions. AU - van Laarhoven,Antoinette I M, AU - Vogelaar,Michiel L, AU - Wilder-Smith,Oliver H, AU - van Riel,Piet L C M, AU - van de Kerkhof,Peter C M, AU - Kraaimaat,Floris W, AU - Evers,Andrea W M, Y1 - 2011/02/24/ PY - 2010/06/20/received PY - 2010/12/06/revised PY - 2011/01/22/accepted PY - 2011/3/1/entrez PY - 2011/3/1/pubmed PY - 2011/10/14/medline SP - 1486 EP - 94 JF - Pain JO - Pain VL - 152 IS - 7 N2 - Physical complaints, such as pain, can be effectively reduced by placebo effects through induction of positive expectations, or increased by nocebo effects through induction of negative expectations. In the present study, verbally induced nocebo and placebo effects on itch were experimentally investigated for the first time. In part 1, the role of verbal suggestions in inducing nocebo effects on itch and pain was investigated. All subjects received the same somatosensory quantitative sensory testing stimuli, that is, mechanical and electrical stimuli and application of histamine, and verbal suggestions to manipulate expectations regarding the stimuli. The suggestions were designed to produce either high expectations for itch (itch nocebo) or pain (pain nocebo) or low expectations for itch (itch nocebo control) or pain (pain nocebo control). Results showed that high itch and pain expectations resulted in higher levels of itch and pain, respectively. When comparing nocebo effects, induced by verbal suggestions, results were more pronounced for itch than for pain. In part 2, verbal suggestions designed to produce a placebo effect on itch (itch placebo) or pain (pain placebo), or neutral suggestions (itch placebo control and pain placebo control) were given regarding a second application of histamine and compared with the first application applied in part 1. Results of placebo effects only showed a significantly larger decrease in itch in the itch placebo condition than in the pain placebo condition. In conclusion, we showed for the first time that nocebo and possibly placebo responses can be induced on itch by verbal suggestions. SN - 1872-6623 UR - https://www.unboundmedicine.com/medline/citation/21353388/Induction_of_nocebo_and_placebo_effects_on_itch_and_pain_by_verbal_suggestions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3959(11)00081-9 DB - PRIME DP - Unbound Medicine ER -