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Memory-related hippocampal functioning in ecstasy and amphetamine users: a prospective fMRI study.
Benjamin Becker1, Daniel Wagner, Philip Koester
1Department of Psychiatry and Psychotherapy, University of Cologne, Kerpener Strasse 62, 50924 Cologne, Germany. ben_becker@gmx.de
Psychopharmacology
|September 25, 2012
Summary
Ecstasy use specifically impacts memory-related hippocampal functioning, showing decreased activity in the left parahippocampal gyrus with continued use. This effect was linked to ecstasy, not amphetamine, though memory performance did not differ significantly.
Area of Science:
- Neuroscience
- Psychopharmacology
- Cognitive Science
Background:
- Recreational ecstasy (3,4-methylenedioxymethamphetamine [MDMA]) use is linked to memory impairments.
- Previous cross-sectional studies suggest altered hippocampal functioning in ecstasy-polydrug users.
- Potential pre-existing differences or confounding effects of amphetamine use require prospective investigation.
Purpose of the Study:
- To prospectively examine the specific effects of ecstasy on memory-related hippocampal functioning.
- To differentiate the impact of ecstasy from amphetamine on memory-related brain activity.
- To investigate longitudinal changes in hippocampal function associated with drug use patterns.
Main Methods:
- Functional magnetic resonance imaging (fMRI) and an associative memory task were employed.
- 40 ecstasy and/or amphetamine users with limited prior exposure were studied at baseline (t1) and 12 months (t2).
- Continued users (n=17) were compared to abstainers (n=12) based on t2 drug use reports.
Main Results:
- Encoding-related activity in the left parahippocampal gyrus showed differential changes between groups.
- Abstinent subjects exhibited increased activity, while continued users showed decreased activity from t1 to t2.
- Decreased activity in the left parahippocampal gyrus correlated with ecstasy use, independent of amphetamine use, but memory performance remained unaffected.
Conclusions:
- Findings suggest specific detrimental effects of ecstasy on memory-related hippocampal functioning.
- The observed changes in hippocampal activity are specifically associated with ecstasy consumption.
- Alternative explanations, including potential cannabis effects, warrant further consideration.
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