Cannabinoids consistently facilitate extinction of traumatic memories in animal and human studies
Activating CB1 receptors, either directly or by boosting endocannabinoids, facilitates the extinction of aversive memories with large effect sizes, offering therapeutic potential for PTSD.
Quick Facts
What This Study Found
Direct or indirect CB1 receptor activation consistently facilitated extinction of aversive/traumatic memories across animal and human studies. Effect sizes were large (Cohen's d >= 1.0) in most cases. Key brain areas involved include the medial prefrontal cortex, amygdala, and hippocampus. Timing of administration (around memory formation or reminders) influenced outcomes.
Key Numbers
Effect sizes were large (Cohen's d >= 1.0) in most studies. Effects observed in medial prefrontal cortex, amygdala, and hippocampus. Both CB1 activation and endocannabinoid augmentation were effective.
How They Did This
Comprehensive review of animal and human studies on cannabinoid interventions for aversive memory extinction, with effect size calculations for each intervention.
Why This Research Matters
PTSD is fundamentally a disorder of aversive memory that resists extinction. If cannabinoids reliably facilitate this extinction process, they could enhance exposure-based therapies that are the current gold standard for PTSD treatment.
The Bigger Picture
The endocannabinoid system appears to be a natural mechanism for updating threat memories. Enhancing this system pharmacologically could make existing trauma therapies more effective rather than requiring entirely new treatment approaches.
What This Study Doesn't Tell Us
Most data comes from animal studies with relatively simple fear conditioning paradigms. Human PTSD involves more complex memory processing. Few clinical trials have tested cannabinoid augmentation of PTSD therapy.
Questions This Raises
- ?Could cannabinoids be used as adjuncts to exposure therapy for PTSD?
- ?What is the optimal timing of cannabinoid administration relative to trauma memory reactivation?
Trust & Context
- Key Stat:
- Cohen's d >= 1.0 effect sizes
- Evidence Grade:
- Strong: consistent findings across multiple animal and human studies with quantified large effect sizes.
- Study Age:
- Published in 2019.
- Original Title:
- Tempering aversive/traumatic memories with cannabinoids: a review of evidence from animal and human studies.
- Published In:
- Psychopharmacology, 236(1), 201-226 (2019)
- Authors:
- Lisboa, Sabrina F(2), Vila-Verde, C, Rosa, J, Uliana, D L, Stern, C A J, Bertoglio, L J, Resstel, L B, Guimaraes, F S
- Database ID:
- RTHC-02141
Evidence Hierarchy
Summarizes existing research on a topic.
What do these levels mean? →Frequently Asked Questions
How might cannabinoids help with PTSD?
They appear to facilitate extinction of traumatic memories, the same process targeted by exposure therapy. By boosting the endocannabinoid system, they may help the brain update threat memories more effectively.
Is there human evidence for this?
Some human studies confirm cannabinoid facilitation of fear extinction, though clinical trials specifically testing cannabinoid-augmented PTSD therapy remain limited.
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Cite This Study
https://rethinkthc.com/research/RTHC-02141APA
Lisboa, Sabrina F; Vila-Verde, C; Rosa, J; Uliana, D L; Stern, C A J; Bertoglio, L J; Resstel, L B; Guimaraes, F S. (2019). Tempering aversive/traumatic memories with cannabinoids: a review of evidence from animal and human studies.. Psychopharmacology, 236(1), 201-226. https://doi.org/10.1007/s00213-018-5127-x
MLA
Lisboa, Sabrina F, et al. "Tempering aversive/traumatic memories with cannabinoids: a review of evidence from animal and human studies.." Psychopharmacology, 2019. https://doi.org/10.1007/s00213-018-5127-x
RethinkTHC
RethinkTHC Research Database. "Tempering aversive/traumatic memories with cannabinoids: a r..." RTHC-02141. Retrieved from https://rethinkthc.com/research/lisboa-2019-tempering-aversivetraumatic-memories-with
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.