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Related Concept Videos

The Placebo Effect01:54

The Placebo Effect

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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.
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Blind Procedures02:07

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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...
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Blinding01:11

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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.
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Related Experiment Video

Updated: Jan 11, 2026

How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants
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Placebo Responses in Trials for Multiple Sclerosis.

Luana Gilio1, Diego Centonze2, Mario Stampanoni Bassi3

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High placebo responses in multiple sclerosis clinical trials complicate results. Understanding factors influencing these placebo effects is crucial for accurate interpretation of treatment efficacy in randomized controlled trials.

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Area of Science:

  • Neurology
  • Clinical Trials
  • Pharmacology

Background:

  • Placebo responses present significant challenges in multiple sclerosis (MS) randomized controlled trials (RCTs).
  • Substantial improvements are frequently observed in placebo arms for both disease-modifying therapies and symptomatic treatments in MS.
  • This placebo effect phenomenon appears to be increasing in recent MS studies.

Purpose of the Study:

  • To highlight the challenges posed by placebo responses in MS clinical trials.
  • To discuss potential mechanisms influencing placebo effects in MS.
  • To emphasize the importance of considering these factors in trial design and data interpretation.

Main Methods:

  • Literature review and analysis of placebo response trends in MS clinical trials.
  • Identification of factors contributing to placebo effects.
  • Discussion of implications for clinical trial methodology.

Main Results:

  • Significant improvements are consistently noted in placebo groups for MS treatments.
  • Recent studies show a pronounced increase in placebo response magnitude.
  • Multiple factors, including evolving diagnostic criteria and patient expectations, influence placebo responses.

Conclusions:

  • Placebo responses significantly impact the interpretation of treatment efficacy in MS trials.
  • Careful consideration of trial design, population characteristics, and placebo type is essential.
  • Further research into placebo mechanisms is needed to refine MS clinical trial methodologies.