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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.
Combined Effects of Drugs: Antagonism01:30

Combined Effects of Drugs: Antagonism

The combined effects of drugs can result in various interactions, of which an important type is antagonism. Antagonism is a mechanism where one drug inhibits or counteracts the effects of another drug. Antagonism can occur through various means, including receptor binding, allosteric modulation, functional interaction, chemical reactions, and pharmacokinetic processes.
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
Drug-Receptor Interaction: Antagonist01:28

Drug-Receptor Interaction: Antagonist

An antagonist is a drug that binds strongly to a receptor without activating it. An antagonist prevents other molecules, such as neurotransmitters or hormones, from binding to the receptor and triggering a cellular response. Such interaction effectively hinders the normal physiological processes mediated by the receptor, resulting in various pharmacological effects depending on the specific receptor targeted.
Antagonists can be classified as competitive or noncompetitive based on their...
Local Anesthetics: Adverse Effects01:12

Local Anesthetics: Adverse Effects

While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...

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Related Experiment Video

Updated: May 31, 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

Placebo - More hatred than love.

Hong-Liang Zhang1

  • 1Department of Neurology, The First Hospital of Jilin University, Changchun, China. Department of Neurobiology, Care Sciences and Society, Karolinska Institute, Stockholm, Sweden.

Journal of Neurosciences in Rural Practice
|July 1, 2011
PubMed
Summary

Placebos are sham treatments with scientifically supported mechanisms. Ethical concerns arise from their use in randomized controlled trials (RCTs), potentially delaying optimal patient care.

Area of Science:

  • Medical Ethics
  • Clinical Trials
  • Psychoneuroimmunology

Background:

  • Placebos are interventions designed to mimic medical treatments but lack specific therapeutic intent.
  • Scientific evidence supports the existence of placebo effects, mediated by various biological mechanisms.
  • Placebo effects are observed in both healthy individuals and patients across diverse medical conditions.

Purpose of the Study:

  • To explore the ethical considerations surrounding the use of placebos in clinical research.
  • To highlight the potential conflict between placebo use in trials and timely patient treatment.
  • To advocate for a re-evaluation of control group designs in randomized controlled trials.

Main Methods:

  • Review of existing literature on placebo mechanisms and ethical debates.
Keywords:
Ethicsplaceborandomized control trials

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  • Analysis of the implications of placebo use in randomized controlled trials (RCTs).
  • Discussion of the ethical challenges posed by withholding potentially effective treatments.

    • Main Results:

    • Laboratory evidence confirms biological mechanisms underlying placebo effects.
    • The widespread application of placebos in RCTs raises significant ethical questions.
    • Participants in placebo-controlled trials may not receive optimal or timely treatment.

    Conclusions:

    • The use of placebos in randomized controlled trials (RCTs) necessitates careful ethical scrutiny.
    • Refining the design of control groups in RCTs is crucial to address ethical concerns.
    • Balancing research integrity with patient welfare requires ongoing attention to placebo protocols.