An fMRI study found that people with cannabis use disorder showed altered brain connectivity between the amygdala, hypothalamus, and prefrontal cortex when processing negative emotional faces.
Addiction neuroscientists, cardiovascular risk researchers, and clinicians treating cannabis use disorder.
Enhanced amygdala-hypothalamus connectivity correlated with perceived stress in CUD
What the researchers found
Compared to 23 controls, 23 people with cannabis use disorder showed stronger amygdala-to-hypothalamus connectivity and amygdala-to-fusiform gyri connectivity when viewing fearful/angry faces. This enhanced connectivity correlated with perceived stress levels. A compensatory prefrontal-to-fusiform connection appeared to serve a protective function.
Why it matters
Cannabis use disorder is associated with increased cardiovascular risk during stress. This study identifies a specific brain circuit (amygdala to hypothalamus) that may mediate stress-related health risks in CUD.
The numbers in context
23 CUD subjects, 23 controls; enhanced amygdala-hypothalamus and amygdala-fusiform connectivity; correlations with Perceived Stress Scale scores.
How the study worked
Dynamic causal modeling of fMRI data from 23 CUD subjects and 23 matched controls from the Human Connectome Project during an emotional face-matching task.
What this study cannot tell us
Cross-sectional design; relatively small sample; cannot determine whether connectivity changes cause or result from cannabis use; Human Connectome Project sample may not represent clinical CUD populations.
How to read the evidence
Moderate: well-designed fMRI with HCP data, but small groups and cross-sectional.
When this study was published
Published 2020.
The bigger picture
The central autonomic network connects emotional processing to physical stress responses (heart rate, blood pressure). Altered connectivity in CUD could explain why cannabis-dependent individuals show exaggerated cardiovascular responses to stress.
Questions still open
- Does cannabis cessation normalize these connectivity patterns? Could this circuit explain stress-triggered cardiovascular events in cannabis users?
Common questions
How does cannabis use disorder change brain stress responses?
Is there a protective brain mechanism?
Read the original research
Altered Effective Connectivity of Central Autonomic Network in Response to Negative Facial Expression in Adults With Cannabis Use Disorder.
Biological psychiatry. Cognitive neuroscience and neuroimaging, 5(1), 84-96
Citation
Ma, Liangsuo; Steinberg, Joel L; Bjork, James M; Wang, Qin; Hettema, John M; Abbate, Antonio; Moeller, F Gerard. (2020). Altered Effective Connectivity of Central Autonomic Network in Response to Negative Facial Expression in Adults With Cannabis Use Disorder.. Biological psychiatry. Cognitive neuroscience and neuroimaging, 5(1), 84-96. https://doi.org/10.1016/j.bpsc.2019.05.013
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