A single hit of vaporized THC suppressed brain gamma waves in rats for at least a week
One exposure to vaporized THC reduced gamma-frequency brain activity in rats across multiple brain regions, with effects persisting seven days later.
Quick Facts
What This Study Found
Vaporized THC suppressed gamma power (>32-100 Hz) in the dorsal striatum, orbitofrontal cortex, and prefrontal cortex of rats, with most changes still present a week after a single exposure.
Key Numbers
Gamma suppression was observed in the >32-100 Hz range across the dorsal striatum, orbitofrontal cortex, and prefrontal cortex. Effects persisted at least 7 days after a single exposure.
How They Did This
Rats were implanted with electrode arrays in three brain regions. They received vaporized THC or vehicle via a Volcano vaporizer in a crossover design with a one-week washout period, and local field potentials were recorded.
Why This Research Matters
Gamma oscillations play a key role in cognition, and reduced gamma activity is a hallmark of schizophrenia. This study shows that even one session of vaporized THC can produce lasting changes in these brain rhythms.
The Bigger Picture
With vaping becoming the preferred delivery method for many cannabis users, understanding how vaporized THC affects brain circuits is increasingly relevant. The persistence of gamma suppression after just one exposure raises questions about cumulative effects with regular use.
What This Study Doesn't Tell Us
This was a rat study, so direct translation to humans is uncertain. The sample size was not reported in the abstract, and only a single dose was tested.
Questions This Raises
- ?Do these gamma suppression effects accumulate with repeated vaporized THC exposure?
- ?Would similar patterns appear in human EEG studies?
- ?Does the effect differ with varying THC concentrations?
Trust & Context
- Key Stat:
- Gamma suppression persisted 7+ days after one THC vapor exposure
- Evidence Grade:
- Preliminary: animal study with a single dose tested in one experiment.
- Study Age:
- Published in 2019.
- Original Title:
- EXTENDED ATTENUATION OF CORTICOSTRIATAL POWER AND COHERENCE AFTER ACUTE EXPOSURE TO VAPOURIZED Δ9 TETRAHYDROCANNABINOL IN RATS.
- Published In:
- The Canadian journal of addiction, 10(3), 60-66 (2019)
- Authors:
- Nelong, Tapia Foute, Jenkins, Bryan W(5), Perreault, Melissa L(3), Khokhar, Jibran Y
- Database ID:
- RTHC-02203
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
What are gamma oscillations?
Gamma waves are fast brain oscillations (30-100 Hz) involved in attention, memory, and perception. They are often reduced in people with schizophrenia.
Why does it matter that effects lasted a week?
Most people assume the effects of a single cannabis use wear off within hours. This study found measurable brain changes persisting at least 7 days, suggesting longer-lasting neural impacts.
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Cite This Study
https://rethinkthc.com/research/RTHC-02203APA
Nelong, Tapia Foute; Jenkins, Bryan W; Perreault, Melissa L; Khokhar, Jibran Y. (2019). EXTENDED ATTENUATION OF CORTICOSTRIATAL POWER AND COHERENCE AFTER ACUTE EXPOSURE TO VAPOURIZED Δ9 TETRAHYDROCANNABINOL IN RATS.. The Canadian journal of addiction, 10(3), 60-66. https://doi.org/10.1097/cxa.0000000000000063
MLA
Nelong, Tapia Foute, et al. "EXTENDED ATTENUATION OF CORTICOSTRIATAL POWER AND COHERENCE AFTER ACUTE EXPOSURE TO VAPOURIZED Δ9 TETRAHYDROCANNABINOL IN RATS.." The Canadian journal of addiction, 2019. https://doi.org/10.1097/cxa.0000000000000063
RethinkTHC
RethinkTHC Research Database. "EXTENDED ATTENUATION OF CORTICOSTRIATAL POWER AND COHERENCE ..." RTHC-02203. Retrieved from https://rethinkthc.com/research/nelong-2019-extended-attenuation-of-corticostriatal
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.