Brain imaging showed less damage in cannabis-induced psychosis compared to schizophrenia with cannabis use
People with cannabis-induced psychosis had fewer white matter abnormalities and greater gray matter volume in key brain regions compared to those with schizophrenia who also used cannabis.
Quick Facts
What This Study Found
Participants with schizophrenia and cannabis use (SZC) had widespread white matter microstructural abnormalities, while those with cannabis-induced psychosis (CIP) had fewer WM disruptions and greater gray matter volumes in the cerebellum and frontal regions.
Key Numbers
60 participants (20 per group). CIP and SZC groups had comparable cannabis use history. SZC showed lower fractional anisotropy in 5 brain regions vs controls. CIP had higher FA than SZC in the left corticospinal tract. CIP had greater cerebellar GM volume than SZC.
How They Did This
Cross-sectional study with three groups of 20 participants: cannabis-induced psychosis, schizophrenia with cannabis use, and controls without substance use. Used diffusion tensor and kurtosis imaging for white matter analysis and voxel-based morphometry for gray matter.
Why This Research Matters
Understanding the brain differences between cannabis-induced psychosis and schizophrenia helps explain why some cannabis users develop temporary psychosis while others progress to a chronic condition.
The Bigger Picture
These structural brain differences may help explain why cannabis-induced psychosis is often temporary while schizophrenia is chronic, and could eventually help clinicians predict which cannabis users are at risk for progression.
What This Study Doesn't Tell Us
Small sample size of 20 per group. Cross-sectional design cannot determine whether brain differences preceded or resulted from the conditions. Convenience sampling may limit representativeness.
Questions This Raises
- ?Could these brain imaging differences be used clinically to distinguish CIP from early schizophrenia?
- ?Do the greater gray matter volumes in CIP protect against progression to schizophrenia?
- ?Would longitudinal imaging show changes over time?
Trust & Context
- Key Stat:
- CIP had better white matter integrity in the corticospinal tract than SZC
- Evidence Grade:
- Preliminary: small sample (20 per group), cross-sectional design, convenience sampling.
- Study Age:
- Published in 2022.
- Original Title:
- White Matter Microstructure and Gray Matter Volume in Cannabis-Induced Psychosis and Schizophrenia With Cannabis Use.
- Published In:
- The Journal of neuropsychiatry and clinical neurosciences, 34(4), 406-413 (2022)
- Authors:
- Shah, Raghav(3), Ghosh, Abhishek(6), Avasthi, Ajit(4), Ahuja, Chirag K, Khandelwal, Niranjan, Nehra, Ritu
- Database ID:
- RTHC-04214
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
What is the difference between cannabis-induced psychosis and schizophrenia?
Cannabis-induced psychosis (CIP) is a psychotic episode triggered by cannabis use that typically resolves. Schizophrenia is a chronic condition. Some people who use cannabis and develop psychosis may already have underlying schizophrenia.
What do the brain differences suggest?
Better white matter integrity and greater gray matter volumes in CIP may serve as protective factors against progression to chronic schizophrenia, though this is a hypothesis that needs longitudinal testing.
Did the two psychosis groups use cannabis differently?
No. The CIP and SZC groups had comparable age at cannabis initiation and similar duration and frequency of use, suggesting the brain differences were not due to different cannabis exposure.
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Cite This Study
https://rethinkthc.com/research/RTHC-04214APA
Shah, Raghav; Ghosh, Abhishek; Avasthi, Ajit; Ahuja, Chirag K; Khandelwal, Niranjan; Nehra, Ritu. (2022). White Matter Microstructure and Gray Matter Volume in Cannabis-Induced Psychosis and Schizophrenia With Cannabis Use.. The Journal of neuropsychiatry and clinical neurosciences, 34(4), 406-413. https://doi.org/10.1176/appi.neuropsych.21070172
MLA
Shah, Raghav, et al. "White Matter Microstructure and Gray Matter Volume in Cannabis-Induced Psychosis and Schizophrenia With Cannabis Use.." The Journal of neuropsychiatry and clinical neurosciences, 2022. https://doi.org/10.1176/appi.neuropsych.21070172
RethinkTHC
RethinkTHC Research Database. "White Matter Microstructure and Gray Matter Volume in Cannab..." RTHC-04214. Retrieved from https://rethinkthc.com/research/shah-2022-white-matter-microstructure-and
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.