Young adults with bipolar disorder showed increased amygdala-prefrontal connectivity during stress, and this brain response was associated with less frequent cannabis use and shorter, less severe depression over one-year follow-up.
Psychiatrists treating bipolar disorder, neuroimaging researchers, and clinicians managing dual-diagnosis patients.
Stronger stress response linked to less cannabis use and less depression
What the researchers found
People with bipolar disorder showed increased right amygdala-rostral prefrontal cortex connectivity during stress compared to controls. Greater connectivity increase was associated with less frequent cannabis use and prospectively with shorter duration and lower severity of depression symptoms over one year.
Why it matters
Understanding how stress response circuits relate to both cannabis use and mood outcomes in bipolar disorder could identify biomarkers for disease course and potential intervention targets.
The numbers in context
42 participants (19 bipolar, 23 controls). Mean age 21.4 years. Greater right amygdala-rPFC connectivity during stress in bipolar group. This connectivity associated with less cannabis use and better depression outcomes over 1-year follow-up.
How the study worked
fMRI study of 42 young adults (19 with bipolar disorder, mean age 21.4) during the Montreal Imaging Stress Task. A subset of bipolar participants completed 1-year follow-up assessments for mood symptoms and substance use.
What this study cannot tell us
Very small sample (19 bipolar participants). Preliminary associations, not causal. Follow-up subset even smaller. Cannabis use measured as correlate, not experimentally manipulated. Multiple comparisons increase false positive risk.
How to read the evidence
Small pilot neuroimaging study with preliminary one-year follow-up associations.
When this study was published
Published in 2022.
The bigger picture
The finding that stronger prefrontal regulation of the amygdala during stress correlates with both less cannabis use and better depression outcomes suggests a shared neural mechanism underlying self-regulation in bipolar disorder.
Questions still open
- Does cannabis use weaken the prefrontal stress response in bipolar disorder, or do those with stronger responses naturally use less? Could stress management interventions strengthen this circuit and reduce both cannabis use and depression?
Common questions
How does cannabis relate to bipolar disorder outcomes?
Does the brain handle stress differently in bipolar disorder?
Read the original research
Neural functional connectivity changes to psychosocial stress in young adults with bipolar disorder and preliminary associations with clinical trajectories.
Bipolar disorders, 24(3), 298-309
Citation
Kirsch, Dylan E; Preston, Alex; Tretyak, Valeria; Le, Vanessa; Weber, Wade; Strakowski, Stephen M; Lippard, Elizabeth T C. (2022). Neural functional connectivity changes to psychosocial stress in young adults with bipolar disorder and preliminary associations with clinical trajectories.. Bipolar disorders, 24(3), 298-309. https://doi.org/10.1111/bdi.13127
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