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Canna~Fangled Abstracts

Cannabis Use Improves PTSD-Linked Memory Pattern Separation

By April 25, 2025No Comments

 

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. 2025 Apr 24;4(1):13.

doi: 10.1038/s44184-025-00126-w.

Impaired mnemonic pattern separation associated with PTSD symptoms paradoxically improves with regular cannabis use

Jacob Ross 1 2, Bruna Cuccurazzu 3, Dylan Delmar 3, Christian Cortez 3, Giovanni Castillo 3, Dean T Acheson 3 4, Dewleen G Baker 3 4, Victoria B Risbrough 3 4, Daniel M Stout 3 4
Affiliations 

Abstract

Posttraumatic stress disorder (PTSD) is associated with poor hippocampal function and disrupted pattern recognition. Cannabis use is highly prevalent in individuals with PTSD, yet the impact on these cognitive functions is poorly understood. Participants (n = 111) with a range of PTSD symptoms with and without regular cannabis use completed the mnemonic similarity task. We hypothesized that regular use would be associated with alterations in pattern separation ability in individuals with PTSD symptoms. High PTSD symptoms were associated with reduced pattern separation performance in minimal users.

Regular users with high PTSD symptoms showed greater pattern separation, but reduced pattern separation with low PTSD symptoms. These results suggest that regular cannabis use may disrupt pattern separation and similar hippocampal-dependent processes, while it may improve pattern separation in individuals with high PTSD symptoms. These cross-sectional results require longitudinal follow-up studies to evaluate the causal effects of regular cannabis use on cognitive function in PTSD.

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Conflict of interest statement

Competing interests: The authors declare no competing interests.

References

    1. Brewin, C. R. The nature and significance of memory disturbance in posttraumatic stress disorder. Annu Rev. Clin. Psychol. 7, 203–227 (2011). – PubMed – DOI
    1. Desmedt, A., Marighetto, A. & Piazza, P. V. Abnormal fear memory as a model for posttraumatic stress disorder. Biol. Psychiatry 78, 290–297 (2015). – PubMed – DOI
    1. Acheson, D. T., Gresack, J. E. & Risbrough, V. B. Hippocampal dysfunction effects on context memory: possible etiology for posttraumatic stress disorder. Neuropharmacology 62, 674–685 (2012). – PubMed – DOI
    1. Dunsmoor, J. E., Cisler, J. M., Fonzo, G. A., Creech, S. K. & Nemeroff, C.B. Laboratory models of post-traumatic stress disorder: The elusive bridge to translation. Neuron 110, 1754–1776 (2022). – PubMed – PMC – DOI
    1. Liberzon, I. & Abelson, J. L. Context processing and the neurobiology of post-traumatic stress disorder. Neuron 92, 14–30 (2016). – PubMed – PMC – DOI

For many people with PTSD, memory distortion isn’t just frustrating; it’s debilitating. This study provides meaningful insight into how cannabis may help restore a vital cognitive process called pattern separation, especially in those with severe symptoms. While more research is needed, these findings reinforce what many patients and advocates have long observed: when carefully integrated, cannabis can offer not only relief from trauma but also a clearer path forward…

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