Related Experiment Video
Updated: Jun 18, 2026
13:18
Robotically Delivered fMRI-Guided Personalized Transcranial Magnetic Stimulation Therapy for Treatment-Resistant Depression
Published on: April 10, 2026
Expectations and Motivations for Participation in Clinical Trials Utilizing Psychedelics for Treatment-Resistant
Christopher Poppe1,2, Liisa Lyck1, Laura Bechtold1,2
1Department of Psychiatry and Neurosciences, Campus Charité Mitte, Charité-Universitätsmedizin Berlin, Berlin, Germany.
Brain and Behavior
|June 17, 2026
Summary
Participant expectations in psychedelic trials for treatment-resistant depression are complex and evolve. Understanding these motivations and expectations is crucial for interpreting clinical outcomes and improving trial design.
Area of Science:
- Psychiatry
- Clinical Psychology
- Neuroscience
Background:
- Participant expectations significantly influence clinical trial outcomes, contributing to placebo effects.
- The subjective and multidimensional nature of expectations, particularly in treatment-resistant depression (TRD), requires further exploration.
- Existing quantitative tools may not fully capture the nuances of participant expectations in psychedelic research.
Purpose of the Study:
- To explore the motivations and expectations of individuals participating in clinical trials involving psychedelics for TRD.
- To understand the factors influencing participants' decisions to join these trials.
- To investigate how expectations are formed and potentially change throughout the trial process.
Main Methods:
- Conducted 17 semi-structured interviews with individuals before screening for TRD trials using 5-MeO-DMT or psilocybin.
- Performed two follow-up interviews with participants post-trial.
- Analyzed interview data thematically to identify key themes and subthemes related to motivations and expectations.
Main Results:
- Identified two primary themes: motivations (hope, demoralization, prior psychedelic experience, social factors) and expectations (symptom reduction, perceived mechanisms, setting, retrospective views).
- Many participants viewed trial involvement as a final option due to chronic illness and treatment failure.
- Retrospective accounts indicated that initial expectations could be reinterpreted as stronger post-participation.
Conclusions:
- Participant expectations in psychedelic trials are intricate and dynamic, evolving over the course of the study.
- There is a critical need to systematically address and measure expectancy in clinical trial design, informed consent procedures, and the interpretation of results.
- These insights are particularly relevant for studies involving treatment-resistant populations and psychedelic interventions.
Related Concept Videos
01:54The Placebo Effect
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.
01:26Psychosis: Goals of Pharmacotherapy
Antipsychotic drugs are a crucial treatment method for acute and chronic psychoses, bipolar illness, and behavioral disorders. The selection of these drugs depends on several factors, including the state of the disease, clinical judgment, possible drug interactions, and the patient's sensitivity to adverse effects. In immediate scenarios, such as delirium and dementia, short-term treatment with low doses of high-potency typical or atypical agents can effectively manage symptom exacerbation. For...
01:29Psychodynamic Therapy
Psychodynamic therapies emphasize the exploration of unconscious processes and early childhood experiences as fundamental contributors to psychological difficulties. These therapies, deeply rooted in Freud's psychoanalytic theory, aim to uncover and resolve unconscious conflicts, granting individuals insights that promote emotional and behavioral healing. Contemporary psychodynamic approaches have evolved, integrating a broader range of influences and methodologies while still valuing the...
01:22CNS Stimulants: Psychedelic Agents
Hallucinogens, also known as psychedelic drugs, are a class of substances known for their ability to alter perception, cognition, and emotions. Despite their profound effects on the mind, these drugs are non-addictive, setting them apart from many other abused substances. The mechanism of action of these drugs lies in their impact on the 5-HT2A receptor in the brain. Upon activation, this receptor couples to Gq-type G proteins, triggering a cascade that releases intracellular calcium. This...
01:27Depressive Disorders: Etiology
Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
Biological Factors in Depression
Biological predispositions significantly influence the risk of developing depressive disorders. Genetic studies highlight the role of variations in the serotonin transporter...
Biological Factors in Depression
Biological predispositions significantly influence the risk of developing depressive disorders. Genetic studies highlight the role of variations in the serotonin transporter...
01:25Elements Crucial for Effective Psychotherapy
Research has highlighted several critical factors that influence the effectiveness of psychotherapy, such as the therapeutic alliance, the therapist, and the client.
The Therapeutic Alliance
The therapeutic alliance refers to the relationship between the therapist and the client. The alliance strengthens when the therapist and the client engage in a nurturing, supportive, trusting, empathetic, and respectful relationship, improving therapeutic outcomes. Therapists must monitor this relationship...
The Therapeutic Alliance
The therapeutic alliance refers to the relationship between the therapist and the client. The alliance strengthens when the therapist and the client engage in a nurturing, supportive, trusting, empathetic, and respectful relationship, improving therapeutic outcomes. Therapists must monitor this relationship...