A neuroimaging meta-analysis found that cannabis users consistently show decreased activation in brain regions supporting cognitive control (anterior cingulate and dorsolateral prefrontal cortex) and increased activation in reward-processing regions (striatum).
Neuroscience researchers, addiction specialists, cannabis risk communicators.
Three convergent brain changes: decreased cognitive control (ACC), decreased attention (DLPFC), and increased reward processing (striatum).
What the researchers found
Cannabis users showed decreased activation in the anterior cingulate cortex (linked to cognitive control) and dorsolateral prefrontal cortex (linked to attention). Conversely, increased activation was observed in the striatum (linked to reward processing). These regions co-activated with broader networks, suggesting widespread functional consequences.
Why it matters
By aggregating across many individual studies, this meta-analysis identifies the most robust brain changes associated with cannabis use: impaired cognitive control and enhanced reward processing. This pattern is consistent with addiction neuroscience models.
The numbers in context
Three key regions identified: decreased anterior cingulate cortex activation (cognitive control), decreased DLPFC activation (attention), increased striatum activation (reward). Each region was functionally decoded using large database.
How the study worked
Activation likelihood estimation meta-analysis of neuroimaging studies comparing cannabis users to non-users. Ancillary analyses used a large neuroimaging repository to characterize co-activation networks and functionally decode affected regions.
What this study cannot tell us
Cross-sectional neuroimaging studies cannot determine whether brain changes preceded or followed cannabis use. Heterogeneity in cannabis use patterns across studies. Meta-analytic approach may miss subtle or region-specific effects.
How to read the evidence
Strong - meta-analytic synthesis of multiple neuroimaging studies with functional decoding, providing the most robust brain-level characterization of cannabis effects.
When this study was published
Published in 2018.
The bigger picture
The combination of reduced cognitive control and enhanced reward processing creates a neural environment that could maintain cannabis use: heightened reward from cannabis with diminished ability to control use. This pattern is seen across multiple substance use disorders.
Questions still open
- Do these brain changes reverse with abstinence? Are they present before cannabis use begins (as a risk factor)? Could interventions targeting cognitive control reduce cannabis use?
Common questions
How does cannabis change the brain?
Does cannabis affect decision-making?
Read the original research
Neuroimaging meta-analysis of cannabis use studies reveals convergent functional alterations in brain regions supporting cognitive control and reward processing.
Journal of psychopharmacology (Oxford, England), 32(3), 283-295
Citation
Yanes, Julio A; Riedel, Michael C; Ray, Kimberly L; Kirkland, Anna E; Bird, Ryan T; Boeving, Emily R; Reid, Meredith A; Gonzalez, Raul; Robinson, Jennifer L; Laird, Angela R; Sutherland, Matthew T. (2018). Neuroimaging meta-analysis of cannabis use studies reveals convergent functional alterations in brain regions supporting cognitive control and reward processing.. Journal of psychopharmacology (Oxford, England), 32(3), 283-295. https://doi.org/10.1177/0269881117744995
Explore the wider topic
- How THC Affects Your Amygdala: The Brain's Threat Detector and Cannabis
- The Anandamide Connection: Your Body's Natural Bliss Molecule
- How Long for Cannabinoid Receptors to Return to Normal
- Cannabis and the Developing Brain: What Every Teenager (and Parent) Should Know
- Why Can't I Enjoy Anything Without Weed? The Science Behind It
- Dopamine Recovery After Quitting Weed: What the Science Says
- The Endocannabinoid System Explained Simply: What It Does and Why It Matters
- Your Endocannabinoid System Explained: Why Withdrawal Happens
- Your Nervous System After Quitting Weed: Fight or Flight
- Using Weed Under 18: What It Does to Your Developing Brain
- What THC Does to Your Brain: Why Withdrawal Happens
- THC and Your Prefrontal Cortex: What Cannabis Does to Your Decision-Making Brain
- Weed, Cortisol, and Stress: What Cannabis Does to Your Stress Hormones
- Weed and Memory: What the Science Says About THC and Your Hippocampus
- Weed and Motivation: Is Amotivational Syndrome Real?
- Weed and Your Nervous System: What THC Actually Does to Your Brain and Body
- How Weed Rewires Your Reward System (And How to Reset It)