Placebo Effect
Placebo Effect - Related Videos
06:58
Placebos in Research
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2023
Source: Laboratories of Gary Lewandowski, Dave Strohmetz, and Natalie Ciarocco—Monmouth University Clinical research focuses on the efficacy of treatments for addressing disorders and illnesses. A challenge with this type of research is that participants often have pre-existing beliefs about the treatment, particularly expectations that the treatment will work. Though it has been practiced around the world for centuries, yoga is a relatively recent fitness craze in the United States with a...
01:54
The Placebo Effect
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2020
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. The placebo effect is commonly described in terms of testing the effectiveness of a new medication. Imagine that you work in a pharmaceutical company, and you think you have a new drug that is effective in treating depression. To demonstrate that your medication is effective, you run an...
08:50
How to Study Placebo Responses in Motion Sickness with a Rotation Chair Paradigm in Healthy Participants
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Cited by 9 •
2014
An experimental rotation chair paradigm is used to investigate whether a placebo intervention on motion sickness affects subjective outcome measures only or also affects behavioral and objective measures in a balanced placebo design.
11:51
Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making
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Cited by 9 •
2011
The procedure described in this protocol shows that testosterone administration and folk beliefs about testosterone may be associated with directly opposed social behaviors.
02:07
Blind Procedures
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2020
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...
FAQs
Expectations influence how people attend to symptoms, experience emotions, and process bodily sensations. Verbal suggestions can establish these expectations, which may change perceived well-being even when no direct pharmacological action occurs. In psychology, this mechanism shows how beliefs can contribute to symptom changes and helps explain why the therapeutic context matters during treatment.
Previous treatment experiences can teach a person to associate a therapeutic setting or procedure with symptom improvement. Classical conditioning then allows those learned associations to influence later expectations and responses. This psychological learning process helps account for differences between individuals and shows why treatment history is an important variable when studying placebo-related outcomes.
The placebo effect is linked to brain systems involving endogenous opioids and dopamine. Endogenous opioids are naturally produced substances associated with the brain’s regulation of pain and other responses, while dopamine participates in motivational and expectation-related processes. Their involvement provides biological context for how psychological factors can influence symptom processing without relying on a drug’s direct pharmacological action.
Researchers must account for expectation and therapeutic context when interpreting changes reported during randomized clinical trials. An observed improvement may reflect psychological influences on symptoms or perceived well-being rather than only the tested treatment’s direct pharmacological action. Recognizing this contribution supports more careful trial design and helps clarify what outcome differences can legitimately be attributed to an intervention.
Placebo research is particularly informative for pain and other subjective outcomes because expectations can influence attention, emotion, and symptom processing. These outcomes include a person’s reported experience and perceived well-being, making psychological context relevant to how changes are described and interpreted. Studying them helps clarify the relationship between beliefs and the experience of symptoms.
Clinicians should recognize that verbal suggestions and the broader therapeutic context can shape expectations and influence symptom experience. Ethical communication therefore matters because what patients are told may affect attention, emotion, and perceived outcomes. The placebo effect provides a psychological and scientific context for considering how clinician-patient communication contributes to treatment experiences without confusing those effects with direct pharmacological action.