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Related Concept Videos

The Placebo Effect01:54

The Placebo Effect

The placebo effect occurs when people's expectations or beliefs influence or determine their experience in a given situation. In other words, simply expecting something to happen can actually make it happen.
Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...
Blinding01:11

Blinding

Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
Classical Conditioning in Daily Life01:17

Classical Conditioning in Daily Life

Classical conditioning, a fundamental principle of associative learning, explains various phenomena observed in daily life, such as fear development, the placebo effect, taste aversion, and drug habituation. These applications demonstrate the profound impact of associative learning on human behavior and physiological responses.
John B. Watson and Rosalie Rayner famously demonstrated the development of fear through classical conditioning in their experiment with Little Albert. They paired the...
Regression Toward the Mean01:52

Regression Toward the Mean

Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when researchers try to extrapolate results...
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...

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Related Experiment Video

Updated: Jun 23, 2026

How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants
08:50

How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants

Published on: December 14, 2014

[The placebo effect in medicine].

P Enck1, S Zipfel, S Klosterhalfen

  • 1Medizinische Universitätsklinik VI, Psychosomatische Medizin und Psychotherapie, Forschungsbereich, Universitätsklinikum Tübingen, Frondsbergstrasse 23, 72076, Tübingen, Deutschland. paul.enck@uni-tuebingen.de

Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz
|May 14, 2009
PubMed
Summary

Placebo effects, which improve patient symptoms without a direct drug action, significantly impact medicine efficacy. Research is exploring their mechanisms, history, and ethical considerations in clinical practice.

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Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making
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Published on: March 2, 2011

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Last Updated: Jun 23, 2026

How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants
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How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants

Published on: December 14, 2014

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Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making

Published on: March 2, 2011

Area of Science:

  • Pharmacology and Therapeutics
  • Medical Ethics
  • Clinical Research Methodology

Context:

  • Placebo effects are integral to both clinical trials and routine medical practice.
  • They substantially contribute to the perceived efficacy of medications for common ailments.
  • Growing research interest and publication rates highlight the significance of placebo effects.

Purpose:

  • To review the historical trajectory of placebo use in medicine.
  • To examine the ethical dimensions surrounding placebo administration.
  • To analyze methodological challenges in placebo-controlled trials and alternative research designs.
  • To elucidate the multifaceted mechanisms underlying the placebo response.

Summary:

  • Placebos, as medication surrogates, elicit symptom improvement independent of pharmacological action.
  • This review synthesizes current knowledge on placebo effects, covering their history, ethics, methodology, and underlying mechanisms.
  • The study examines determinants and predictors of placebo response across clinical and experimental settings.

Impact:

  • Informs the development of more robust clinical trial designs.
  • Provides ethical guidelines for placebo use in healthcare.
  • Enhances understanding of the mind-body connection in therapeutic outcomes.
  • Contributes to the integration of placebo knowledge into everyday medical practice.