Current recreational drug users (predominantly ecstasy/cannabis) showed increased brain activation during impulse control tasks despite normal behavioral performance, plus reduced default-mode network deactivation.
Read this if you want to know whether recreational drug use affects brain function even when performance seems normal.
Normal performance achieved through compensatory brain hyperactivation
What the researchers found
Twenty recreational drug users (predominantly ecstasy and cannabis) and 20 healthy controls completed a GO/NOGO impulse control task during fMRI scanning.
Despite no differences in behavioral performance (both groups performed equally), drug users showed significantly elevated brain activation in frontal and parietal regions during successful response inhibition. During errors, users showed hyperactivity in temporal, frontal, and cingulate regions.
Drug users also showed reduced deactivation of the default-mode network during task performance. The default-mode network normally deactivates when the brain focuses on external tasks.
The pattern of compensatory hyperactivation suggested drug users needed greater neural resources to achieve normal performance levels.
Why it matters
The finding that drug users achieved normal performance through increased brain effort suggested a compensatory mechanism that might break down under more demanding conditions, even when standard tests show no deficits.
The numbers in context
20 drug users (10 female) vs 20 controls. No behavioral performance differences. Elevated frontal and parietal BOLD during inhibitions. Temporal, frontal, and cingulate hyperactivity during errors. Reduced default-mode network deactivation.
How the study worked
Cross-sectional fMRI study comparing 20 current recreational drug users (10 female, predominantly ecstasy/cannabis) to 20 healthy controls during a GO/NOGO response inhibition task. BOLD signal measured during successful inhibitions and commission errors.
What this study cannot tell us
Cannot separate effects of ecstasy from cannabis since most users took both. Cross-sectional design cannot determine whether brain differences preceded drug use. Current drug use status was not verified biochemically.
How to read the evidence
Moderate-sized cross-sectional fMRI study that could not separate effects of different drugs or establish causation.
When this study was published
Published in 2010. Understanding of how recreational drug use affects brain function has advanced since.
The bigger picture
These patterns of neural compensation mirrored findings previously observed with "harder" drugs of abuse, suggesting recreational use of ecstasy and cannabis may produce similar (if subtler) disruptions to cognitive control systems.
Questions still open
- At what point does compensatory brain activation fail to maintain normal performance? Which specific drug (ecstasy, cannabis, or their combination) drove these neural changes?
Common questions
Did drug users perform worse on the brain task?
Is this about cannabis or ecstasy?
Read the original research
Evidence of increased activation underlying cognitive control in ecstasy and cannabis users.
NeuroImage, 52(2), 429-35
Citation
Roberts, Gloria M P; Garavan, Hugh. (2010). Evidence of increased activation underlying cognitive control in ecstasy and cannabis users.. NeuroImage, 52(2), 429-35. https://doi.org/10.1016/j.neuroimage.2010.04.192
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