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Choice as a moderator of placebo expectation effects
Additional support from two experiments
Brown, J. A., Fowler, S. L., Rasinski, H. M., Rose, J. P., & Geers, A. L. (2013). Choice as a moderator of placebo expectation effects: Additional support from two experiments. Basic and Applied Social Psychology, 35(5), 436-444. https://doi.org/10.1080/01973533.2013.803968
Two experiments investigated the hypothesis that treatment choice enhances placebo treatment efficacy. In Experiment 1, prior to a pain task, participants were given either an expectation that two (inert) products could reduce pain or no expectation. In addition, participants either selected between the two products or were assigned a product to use. Participants given both the placebo expectation and treatment choice reported the lowest pain. Experiment 2 conceptually replicated this finding using a placebo paradigm with aversive auditory stimuli. Additional control conditions indicated that a choice availability (rather than choice restriction) explanation best accounted for these results.
