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Related Experiment Video

Updated: Jul 16, 2026

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

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

Published on: December 14, 2014

[Placebo effect in Parkinson's disease].

¹Department of Neurology, Wakayama Medical University, 811-1 Kimii-dera, Wakayama 641-8510, Japan.

No to Shinkei = Brain and Nerve

|February 24, 2007

Summary

The placebo effect in Parkinson's disease (PD) can significantly improve motor symptoms, potentially by boosting endogenous dopamine release through expectation. This highlights the role of cognitive mechanisms in PD treatment.

Area of Science:

Neuroscience
Neurology
Psychiatry

Background:

The placebo effect, Latin for "I shall please," is well-documented in clinical trials.
Its effectiveness is particularly notable in anti-parkinsonian drug studies and deep brain stimulation.
Recent research indicates significant motor symptom improvement in Parkinson's disease (PD) patients due to placebo interventions.

Purpose of the Study:

To explore the neurobiological mechanisms underlying the placebo effect in Parkinson's disease (PD).
To investigate the role of endogenous dopamine and cognitive factors in placebo responsiveness in PD patients.

Main Methods:

Utilized positron emission tomography (PET) with raclopride to assess endogenous dopamine release in placebo-responsive PD patients.
Recorded neuronal activity in the subthalamic nucleus (STN) during deep brain stimulation surgery.

Related Experiment Videos

Last Updated: Jul 16, 2026

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

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

Published on: December 14, 2014

Correlated neuroimaging and electrophysiological findings with clinical placebo-induced improvement.

Main Results:

Positron emission tomography (PET) revealed endogenous dopamine release in the dorsal striatum of placebo-responsive PD patients.
Decreased neuronal activity in the subthalamic nucleus (STN) correlated with clinical improvement from placebo.
The placebo effect in PD appears more linked to cognitive mechanisms like expectation than conditioning.

Conclusions:

Placebo effectiveness in Parkinson's disease (PD) may stem from expectation-driven endogenous dopamine release in the striatum.
Cognitive factors, particularly the expectation of clinical improvement, play a crucial role in placebo responses in PD.
Further research into the dopamine-reward system is needed to fully understand placebo mechanisms in PD.