The Placebo Effect
Blind Procedures
Blinding
Understanding Deception
Ethics in Research
Nonconscious Mimicry
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Updated: Apr 19, 2026

How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants
Published on: December 14, 2014
Anne Barnhill1, Franklin G Miller2
1University of Pennsylvania, Philadelphia, Pennsylvania, USA National Institutes of Health, Bethesda, Maryland, USA anne.barnhill@gmail.com.
This critique argues that prescribing comparable placebo treatments (CPTs) without disclosure is deceptive, not a self-fulfilling prophecy. Undisclosed CPTs constitute medical deception, challenging prior ethical justifications.
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