Have Halpern et al. (2004) detected 'residual neuropsychological effects' of MDMA? Not likely

Michael Lyvers*, Penelope Hasking

*Corresponding author for this work

Research output: Contribution to journalComment/debateResearchpeer-review

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[Extract] The preliminary study by Halpern et al. (2004) is a commendable attempt to isolate correlates of ‘Ecstasy’ use from some of the many confounds that have plagued previous work on this controversial issue. However, Halpern et al. go far beyond their data by concluding that the few significant differences they found, out of a great number of comparisons conducted on a small sample of subjects, actually represent ‘residual neuropsychological effects of MDMA.’ Indeed, as their findings fail to establish a cause–effect relationship between heavy MDMA use and neurocognitive impairment, their use of the term ‘residual effect’ is very misleading.
Original languageEnglish
Pages (from-to)149-153
Number of pages5
JournalDrug and Alcohol Dependence
Issue number2
Publication statusPublished - 16 Aug 2004


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