Ecstasy users performed significantly worse on learning and memory tasks than both controls and cannabis users, with distinct brain activation differences, though some neural changes overlapped between ecstasy and cannabis groups.
Read this if you want to understand how ecstasy affects memory differently from cannabis.
Ecstasy users performed worse than both controls and cannabis users on face-name learning
What the researchers found
Twenty recreational ecstasy users, 14 cannabis users, and 20 controls completed a face-learning task during fMRI scanning.
Ecstasy users performed significantly worse at learning and remembering face-name associations compared to both controls and cannabis users.
Brain imaging revealed ecstasy-specific patterns: hyperactivity in bilateral frontal, temporal, parietal, and occipital regions, and hypoactivity in the right dorsal anterior cingulate cortex and left posterior cingulate.
Some brain activation changes overlapped between ecstasy and cannabis groups: both showed decreased activation in the right medial frontal gyrus, left parahippocampal gyrus, left dorsal cingulate, and left caudate.
These results identified both ecstasy-specific and shared ecstasy-cannabis neural effects, with the ecstasy-specific effects potentially related to neurotoxic damage to serotonergic brain regions.
Why it matters
By including a cannabis user comparison group, this study could separate effects attributable specifically to ecstasy from those that might be explained by concurrent cannabis use, a common confound in ecstasy research.
The numbers in context
20 ecstasy users, 14 cannabis users, 20 controls. Ecstasy users performed significantly worse than both other groups. Ecstasy-specific hyperactivity in frontal, temporal, parietal, and occipital regions. Shared ecstasy-cannabis hypoactivity in four brain regions.
How the study worked
Cross-sectional fMRI study comparing 20 ecstasy users, 14 cannabis users (from a previously published study), and 20 controls on a face-name learning task. Conjunction analysis identified drug-specific and shared neural changes.
What this study cannot tell us
Cross-sectional design cannot determine causation. The ecstasy group likely used multiple drugs. Cannabis user data came from a separate study. Groups may have differed in unmeasured ways. Relatively small sample sizes.
How to read the evidence
Cross-sectional fMRI comparison with three groups. Cannabis user data from a separate study limits direct comparison. Small to moderate sample sizes.
When this study was published
Published in 2009. Understanding of ecstasy neurotoxicity has continued to develop, with most evidence supporting persistent serotonergic effects that differ from cannabis-related cognitive changes.
The bigger picture
Disentangling the cognitive effects of different substances is challenging because polydrug use is common. This study advanced understanding by directly comparing ecstasy and cannabis users on the same task.
Questions still open
- Are the shared brain changes between ecstasy and cannabis users caused by cannabis (which both groups used) or by a common vulnerability? Would these effects resolve with sustained abstinence? Do the ecstasy-specific effects reflect serotonergic neurotoxicity?
Common questions
Are the memory problems from ecstasy or cannabis?
Do these brain changes recover?
Read the original research
Learning and memory deficits in ecstasy users and their neural correlates during a face-learning task.
Brain research, 1292, 71-81
Citation
Roberts, Gloria M P; Nestor, Liam; Garavan, Hugh. (2009). Learning and memory deficits in ecstasy users and their neural correlates during a face-learning task.. Brain research, 1292, 71-81. https://doi.org/10.1016/j.brainres.2009.07.040
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