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Placebo effects in mental disorders
Marcel Wilhelm1, Winfried Rief1, Stefan Salzmann2
1Division of Clinical Psychology and Psychotherapy, Department of Psychology, University of Marburg, Marburg, Germany.
Handbook of Clinical Neurology
|October 29, 2025
Summary
Placebo effects significantly impact mental health treatment outcomes, especially for depression and anxiety, often rivaling active treatments. Understanding these psychological and physiological responses can improve therapeutic strategies.
Area of Science:
- Psychiatry
- Psychology
- Neuroscience
Background:
- Placebo effects are a significant factor in mental health treatment.
- Their mechanisms involve complex psychological and physiological interactions.
- Variability exists across different mental health conditions.
Purpose of the Study:
- To critically examine the role and impact of placebo effects in various mental disorders.
- To compare placebo responses with active treatments using systematic reviews and meta-analyses.
- To explore implications for clinical practice and enhancing therapeutic approaches.
Main Methods:
- Systematic reviews and meta-analyses were employed.
- Placebo effects were compared against active pharmacological interventions.
- Data from studies on depression, anxiety, schizophrenia, and bipolar disorder were analyzed.
Main Results:
- Substantial placebo effects were observed, particularly in depression and anxiety.
- Placebo response magnitudes were comparable to pharmacological interventions in some cases.
- Variability in placebo effects across disorders was noted.
Conclusions:
- Understanding placebo mechanisms is crucial for optimizing mental health treatments.
- Potential integration of placebo components, like open-label placebos and enhanced patient-clinician dynamics, could improve outcomes.
- Tailored therapeutic strategies informed by placebo research may enhance treatment effectiveness.
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