Abstract
Rationale
Heavy ecstasy use in humans has been associated with cognitive impairments and changes in cognitive brain function supposedly due to damage to the serotonin system. There is concern that even a single dose of 3,4-methylenedioxymethamphetamine may be neurotoxic, but very little is known about the consequences of a low dose of ecstasy for cognitive brain function.
Objectives
The objective of the study was to assess the effects of a low dose of ecstasy on human cognitive brain function using functional magnetic resonance imaging (fMRI).
Materials and method
We prospectively studied, as part of the NeXT (Netherlands XTC toxicity) study, sustained effects of a low dose of ecstasy on brain function in 25 subjects before and after their first episode of ecstasy use (mean 2.0 ± 1.4 ecstasy pills, on average 11.1 ± 12.9 weeks since last ecstasy use), compared to 24 persistent ecstasy-naive controls, also measured twice and matched with the novice users on age, gender, IQ, and cannabis use. Cognitive brain function was measured in the domains of working memory, selective attention, and associative memory using fMRI.
Results
No significant effects were found of a low dose of ecstasy on working memory, selective attention, or associative memory neither at the behavioral level nor at the neurophysiological level.
Conclusions
This study yielded no firm evidence for sustained effects of a low dose of ecstasy on human cognitive brain function. The present findings are relevant for the development of prevention and harm reduction strategies. Furthermore, the study is relevant to the discussion concerning potential therapeutic use of ecstasy.
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Notes
MAPS Research Information at http://www.maps.org/mdma/ for information on approved phase I and II studies.
Advertisements were placed on the internet, on a special website for this study from the Academic Medical Center Amsterdam and by a pop-up advertising campaign on the Microsoft MSN Network.
NDM 2004 at http://www.trimbos.nl/.
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Acknowledgments
This work was supported by a grant of The Netherlands Organization for Health Research and Development as part of their Addiction Program (ZonMW 310-00-036). We thank Microsoft MSN Network for their generous support concerning the internet pop-up advertisement campaign. We thank Dirk Korf for his valuable contribution to the design of the study, and finally, we thank Jeske Damoiseaux, Mieke Deenen, Judith Bosman, Rianne Petersen, Erika van Hell, and Lenny Ramsey for their assistance with data collection and analyses.
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Jager, G., de Win, M.M., Vervaeke, H.K. et al. Incidental use of ecstasy: no evidence for harmful effects on cognitive brain function in a prospective fMRI study. Psychopharmacology 193, 403–414 (2007). https://doi.org/10.1007/s00213-007-0792-1
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DOI: https://doi.org/10.1007/s00213-007-0792-1