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[Placebo response in functional bowel disorders].

P Enck1, S Klosterhalfen

  • 1Abteilung Innere Medizin VI/Psychosomatische Medizin und Psychotherapie, Universitätsklinikum Tübingen. paul.enck@uni-tuebingen.de

Zeitschrift Fur Gastroenterologie
|March 4, 2006
PubMed
Summary

Understanding the placebo response in functional bowel disorders requires exploring Regression to the Mean (RTM), Pavlovian Conditioning (PC), and Signal Detection Theory (SDT). These models offer rational explanations for placebo effects in medical and psychological treatments.

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Area of Science:

  • Gastroenterology and Psychology
  • Neuroscience

Context:

  • The placebo response in functional bowel disorders is poorly understood, often overlooked.
  • A scientific framework is needed to explain placebo effects in clinical and research settings.

Purpose:

  • To present three theories explaining the placebo response in medical and psychological interventions.
  • To provide a rational approach to understanding placebo effects.

Summary:

  • Regression to the Mean (RTM) attributes placebo effects to measurement "errors" from small sample sizes and symptom variability.
  • Pavlovian Conditioning (PC) explains placebo effects through learned associations between treatments and symptom improvement.
  • Signal Detection Theory (SDT) posits that patient expectations and cognitions, influenced by healthcare interactions, alter symptom perception.

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Impact:

  • These models are illustrated with examples from medical and psychological treatments.
  • Recent functional brain imaging studies exploring cortical correlates of the placebo response are discussed.
  • Potential biological mechanisms, including genetic predisposition, are considered for placebo responsiveness.