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  • Can Pain or Hyperalgesia Be a Classically Conditioned Response in Humans? A Systematic Review and Meta-Analysis

    Author(s)
    Madden, Victoria J
    Harvie, Daniel S
    Parker, Romy
    Jensen, Karin B
    Vlaeyen, Johan WS
    Moseley, G Lorimer
    Stanton, Tasha R
    Griffith University Author(s)
    Harvie, Daniel S.
    Year published
    2016
    Metadata
    Show full item record
    Abstract
    Background. Clinical scenarios of repeated pain usually involve both nociceptive and non-nociceptive input. It is likely that associations between these stimuli are learned over time. Such learning may underlie subsequent amplification of pain, or evocation of pain in the absence of nociception. Methods. We undertook a systematic review and meta-analysis to evaluate the evidence that allodynia or hyperalgesia can be a classically conditioned response. A sensitive search of the literature covered Medline, Embase, CINAHL, AMED, PubMed, Scopus, PsycArticles, PsycINFO, Cochrane Library, and Web of Science. Additional studies ...
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    Background. Clinical scenarios of repeated pain usually involve both nociceptive and non-nociceptive input. It is likely that associations between these stimuli are learned over time. Such learning may underlie subsequent amplification of pain, or evocation of pain in the absence of nociception. Methods. We undertook a systematic review and meta-analysis to evaluate the evidence that allodynia or hyperalgesia can be a classically conditioned response. A sensitive search of the literature covered Medline, Embase, CINAHL, AMED, PubMed, Scopus, PsycArticles, PsycINFO, Cochrane Library, and Web of Science. Additional studies were identified by contacting experts and searching published reviews. Two reviewers independently assessed studies for inclusion, evaluated risk of bias, and extracted data. Studies were included if they aimed to elicit or amplify pain using a classical conditioning procedure in healthy, adult humans. Studies were excluded if they did not distinguish between classical conditioning and explicit verbal suggestion as learning sources, or did not use experiential learning. Results. Thirteen studies, with varying risk of bias, were included. Ten studies evaluated classically conditioned hyperalgesia: nine found hyperalgesia; one did not. Pooled effects (n = 8 with full data) showed a significant pain increase after conditioning (mean difference of 7.40 [95%CI: 4.00–10.80] on a 0–100 pain scale). Three studies evaluated conditioned allodynia and found conflicting results. Conclusion. The existing literature suggests that classical conditioning can amplify pain. No conclusions can be drawn about whether or not classical conditioning can elicit pain. Rigorous experimental conditioning studies with nociceptive unconditioned stimuli are needed to fill this gap in knowledge.
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    Journal Title
    Pain Medicine
    DOI
    https://doi.org/10.1093/pm/pnv044
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Clinical sciences
    Pharmacology and pharmaceutical sciences
    Pharmacology and pharmaceutical sciences not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/141968
    Collection
    • Journal articles

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