Abstract
The current experiment examined whether having choice over treatment options facilitates or inhibits the strength of placebo expectations in the context of pain perception. All participants were exposed to an aversive stimulus (i.e., the cold pressor task), and participants in some conditions were given expectations for two pain-relieving treatments (actually the same inert ointment mixture). Critically, participants in these expectation conditions were also given a choice or not about which of the two treatments they preferred to use. Participants in a control condition were not provided with a treatment expectation. Despite receiving the same inert treatment, participants who had a choice over treatments showed increased placebo analgesia as compared to participants not given a choice and participants in the control condition. Moreover, this effect was mediated by changes in anxiety. Explanations and implications for these results are discussed.
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Notes
Given that we did not extensively prescreen for chronic pain or other health conditions in this college sample, the inclusion of a baseline pain measure allowed us to control for any pre-existing differences in our analyses. It is notable that mean baseline levels of pain did not differ across conditions (F [2, 38] = .05, P > .90) nor did they violate homogeneity of variance assumptions across conditions (Levene’s Statistic = .032, P > .90).
Some readers may still wonder about potential interpretation problems when measuring expectations after the cold pressor task, as opposed to immediately after the manipulation of expectations. First, it should be noted that there is precedence for measuring expectations later in the study to avoid any possible contamination that explicitly thinking about expectations could have on a primary dependent variable (e.g., Geers et al., 2006; Geers et al., 2010). Moreover, although choice and no choice participants reported similar pain expectations on the manipulation-check item, their self-reported pain did differ from one another. This finding suggests that the manipulation-check responses, obtained near the end of the experiment, were not primarily determined by participants’ pain experiences and reports regarding the cold pressor task.
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Rose, J.P., Geers, A.L., Rasinski, H.M. et al. Choice and placebo expectation effects in the context of pain analgesia. J Behav Med 35, 462–470 (2012). https://doi.org/10.1007/s10865-011-9374-0
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DOI: https://doi.org/10.1007/s10865-011-9374-0