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Updated: Jun 11, 2026
08:50
How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants
Published on: December 14, 2014
How placebos change the patient's brain.
Fabrizio Benedetti1, Elisa Carlino, Antonella Pollo
1Department of Neuroscience, University of Turin Medical School, Turin, Italy. fabrizio.benedetti@unito.it
Summary
Placebo effects are diverse, involving multiple brain mechanisms like expectation and learning. Understanding these placebo responses offers insights into treating conditions such as pain and Parkinson's disease.
Area of Science:
- Neuroscience
- Psychology
- Pharmacology
Background:
- Placebos were once dismissed but are now a key research area.
- Placebo effects involve diverse mechanisms across various conditions.
- Neuroscience offers a framework for understanding placebo responses.
Purpose of the Study:
- To explore the multifaceted nature of placebo effects.
- To identify the neurobiological underpinnings of placebo responses.
- To discuss the clinical implications of placebo research.
Main Methods:
- Review of existing research on placebo effects.
- Analysis of neurobiological mechanisms (e.g., expectation, learning, reward).
- Examination of specific conditions like pain and Parkinson's disease.
Main Results:
- Multiple placebo effects exist, driven by distinct mechanisms.
- Involved brain networks include opioidergic-dopaminergic systems for pain and basal ganglia for Parkinson's.
- Placebo responsiveness is linked to cognitive functions and genetic factors.
Conclusions:
- Psychosocial contexts significantly influence brain chemistry and circuitry.
- Placebo mechanisms overlap with those activated by active drugs.
- Impaired prefrontal function reduces or eliminates placebo responses, as seen in Alzheimer's disease.
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