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Updated: Jul 2, 2025

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Expectancy Effects in Psychedelic Trials.

Balázs Szigeti1, Boris D Heifets2

  • 1Translational Psychedelic Research Program, University of California San Francisco, San Francisco, California; Centre for Psychedelic Research, Imperial College London, London, UK.

Biological Psychiatry. Cognitive Neuroscience and Neuroimaging
|February 22, 2024
PubMed
Summary
This summary is machine-generated.

Participant expectations significantly influence psychedelic therapy trials. Understanding and managing these expectancy effects is crucial for accurate research and effective psychedelic treatments.

Keywords:
BlindingExpectancyMicrodosingPlaceboPsychedelicTrial design

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Area of Science:

  • Psychopharmacology
  • Clinical Psychology
  • Neuroscience

Background:

  • Psychedelic compounds like psilocybin, LSD, and DMT are subjects of clinical trials for mental health.
  • Nondrug factors, particularly participant expectations, pose challenges to traditional double-blind, placebo-controlled trial designs.
  • Growing public interest in psychedelic therapy necessitates rigorous evaluation of potential expectancy biases.

Purpose of the Study:

  • To review key concepts and measurement of expectancy in research.
  • To examine reported expectancy effects in modern psychedelic trials (micro- and macrodose).
  • To explore expectancy as a physiological process interacting with drug effects and its potential therapeutic applications.

Main Methods:

  • Literature review of expectancy concepts and measurement.
  • Analysis of expectancy effects in published psychedelic clinical trials.
  • Conceptualization of expectancy as a physiological factor.

Main Results:

  • Expectancy is a significant factor in psychedelic research, complicating blinding.
  • Evidence of expectancy effects exists in both micro- and macrodose psychedelic studies.
  • Expectancy can act independently or interact with the pharmacological effects of psychedelics.

Conclusions:

  • Expectancy effects can be harnessed to potentially improve psychedelic therapy outcomes.
  • Managing expectancy is vital for enhancing the rigor and generalizability of future psychedelic clinical trials.
  • Further research is needed to understand and leverage expectancy in psychedelic-assisted mental health treatments.