Cannabis-dependent men showed greater cognitive performance deterioration under psychosocial stress compared to controls, accompanied by decreased activity in the precuneus brain region.
Addiction neuroscientists, clinicians treating cannabis use disorder, and researchers studying stress-cognition interactions.
Cognitive impairment under stress linked to decreased precuneus activity
What the researchers found
During stress but not during a no-stress condition, cannabis users showed impaired performance on mental arithmetic compared to controls. Subjective stress and cardiovascular responses were similar between groups. fMRI revealed that stress-induced performance decline in cannabis users was accompanied by decreased precuneus activity and increased connectivity between the precuneus and superior frontal gyrus.
Why it matters
Stress is a major trigger for cannabis relapse. Finding that cannabis dependence specifically impairs cognitive function under stress, with identifiable neural correlates, could help explain why stressful situations lead to both impaired function and relapse.
The numbers in context
28 cannabis-dependent men, 23 controls. Impaired performance during stress only (not no-stress). No group differences in subjective stress or cardiovascular response. Decreased precuneus activity and increased precuneus-superior frontal gyrus connectivity during stress in users.
How the study worked
fMRI study of 28 cannabis-dependent men and 23 matched controls using the Montreal Imaging Stress Task, which combines adaptive mental arithmetic with social evaluative threat. Behavioral performance, subjective stress, and cardiovascular responses measured alongside brain imaging.
What this study cannot tell us
Only male participants studied. Cross-sectional design cannot determine if findings preceded or resulted from cannabis use. Cannabis-dependent participants were not acutely intoxicated, but residual effects cannot be fully excluded. Relatively small sample for fMRI.
How to read the evidence
Well-designed fMRI study with appropriate controls, but limited to men and cannot establish causation.
When this study was published
2020 neuroimaging study. First evidence of exaggerated stress-induced cognitive deterioration in cannabis users with neural correlates.
The bigger picture
The dissociation between normal stress perception and impaired stress-related cognition suggests cannabis dependence disrupts how the brain translates stress into action, not how stress is experienced emotionally.
Questions still open
- Would female cannabis users show the same pattern? Does the precuneus deficit recover with abstinence? Could stress-management training improve cognitive resilience in cannabis-dependent individuals?
Common questions
What is the precuneus?
Did cannabis users feel more stressed?
Read the original research
Impaired cognitive performance under psychosocial stress in cannabis-dependent men is associated with attenuated precuneus activity.
Journal of psychiatry & neuroscience : JPN, 45(2), 88-97
Citation
Zhao, Weihua; Zimmermann, Kaeli; Zhou, Xinqi; Zhou, Feng; Fu, Meina; Dernbach, Christian; Scheele, Dirk; Weber, Bernd; Eckstein, Monika; Hurlemann, René; Kendrick, Keith M.; Becker, Benjamin. (2020). Impaired cognitive performance under psychosocial stress in cannabis-dependent men is associated with attenuated precuneus activity.. Journal of psychiatry & neuroscience : JPN, 45(2), 88-97. https://doi.org/10.1503/jpn.190039
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