Residual neuropsychological effects of illicit 3,4-methylenedioxymethamphetamine (MDMA) in individuals with minimal exposure to other drugs.
John H. Halpern, Harrison G. Pope, Andrea R Sherwood, Steven Barry, James I. Hudson, Deborah A Yurgelun-Todd
Drug and Alcohol Dependence August 16, 2004 DOI: 10.1016/j.drugalcdep.2004.02.008 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Observational cross-sectional study Peer reviewed |
|---|---|
| Sample size | 39 |
| Population | Young MDMA users reporting minimal exposure to other drugs including alcohol, and comparison individuals involved in the rave subculture reporting no MDMA use |
| Topics | MDMA |
| Key findings | Heavy MDMA users (60-450 lifetime uses) showed significant deficits on many neuropsychological measures, especially mental processing speed and impulsivity, while moderate users (22-50 lifetime uses) showed virtually no differences from non-users. Overall group differences rarely reached statistical significance. The authors argue these findings augment evidence that MDMA itself, rather than associated factors, is responsible for the observed deficits. |
Abstract
A substantial literature suggests that users of illicit 3,4-methylenedioxymethamphetamine (MDMA or "ecstasy") display residual cognitive deficits. Most MDMA users, however, use other illicit drugs as well, so it is difficult to be certain that these deficits are due to MDMA, as opposed to other drug use or additional confounding factors. We administered a battery of neuropsychological tests to 23 young MDMA users who reported minimal exposure to any other drugs, including alcohol, and to 16 comparison individuals equally involved with the rave subculture, but reporting no MDMA use. We compared the groups by regression analyses adjusting for numerous potentially confounding variables. To test for a possible dose-response effect, we also performed a median split of 12 moderate MDMA users (22-50 lifetime uses) and 11 heavy users (60-450 uses), and compared these subgroups with non-users. MDMA users as a whole performed worse than non-users on most test measures, but these comparisons rarely reached statistical significance. This picture changed markedly in the subgroup analysis: although moderate users displayed virtually no differences from non-users on any measures, the heavy users displayed significant deficits on many measures, particularly those associated with mental processing speed and impulsivity. These differences did not appear explainable by differences in family-of-origin variables, verbal IQ, levels of depression, or time since last MDMA use. The presence of residual cognitive deficits, even among unusually "pure" frequent users of illicit MDMA, analyzed with adjustment for confounding variables, augments the evidence that MDMA itself, rather than some associated factor, is responsible for the deficits observed.
Comparable studies
Other cross-sectional and survey studies on MDMA, most cited first.
| Study | Year | Design | Participants |
|---|---|---|---|
| Recreational MDMA use in Sydney: a profile of ‘Ecstasy’ users and their experiences with the drug Recreational Ecstasy users recruited via snowball peer network | 1992 | Cross-sectional survey | n = 100 |
| Reducedin vivobinding to the serotonin transporter in the cerebral cortex of MDMA (‘ecstasy’) users Male regular ecstasy users and well-matched controls | 1999 | Cross-sectional association study | n = 20 |
| Patterns of simultaneous polysubstance use in drug using university students Drug-using university students | 2006 | Cross-sectional survey | n = 149 |
| Patterns of recreational drug use at dance events in Edinburgh, Scotland Drug users at dance events in Edinburgh, Scotland, UK, aged 16-47, 80% between 18 and... | 2001 | Cross-sectional survey | n = 122 |
| Acute, sub‐acute and long‐term subjective consequences of ‘ecstasy’ (MDMA) consumption in 430 regular users Regular MDMA users | 2003 | Cross-sectional study | n = 466 |
Citations in the library
Cited by 56
- Durability of improvement in post-traumatic stress disorder symptoms and absence of harmful effects or drug dependency after 3,4-methylenedioxymethamphetamine-assisted psychotherapy: a prospective long-term follow-up study. Journal of Psychopharmacology 2013
- Clinical applications of hallucinogens: A review. Experimental and Clinical Psychopharmacology August 1, 2016
- Neurotoxicity of methylenedioxyamphetamines (MDMA; ecstasy) in humans: how strong is the evidence for persistent brain damage? Addiction February 27, 2006
- Psychological and cognitive effects of long-term peyote use among Native Americans. Biological Psychiatry October 15, 2005
- Human psychobiology of MDMA or ‘Ecstasy’: an overview of 25 years of empirical research Human Psychopharmacology: Clinical and Experimental July 1, 2013
and 51 more in the library
Cites 10
- Positron emission tomographic evidence of toxic effect of MDMA (“Ecstasy”) on brain serotonin neurons in human beings The Lancet October 1, 1998
- Memory impairment in abstinent MDMA ("Ecstasy") users Neurology December 1, 1998
- Impaired cognitive performance in drug free users of recreational ecstasy (MDMA) Journal of Neurology, Neurosurgery, and Psychiatry June 1, 2000
- Reducedin vivobinding to the serotonin transporter in the cerebral cortex of MDMA (‘ecstasy’) users The British Journal of Psychiatry July 1, 1999
- Cognitive performance in recreational users of MDMA or 'ecstasy': evidence for memory deficits Journal of Psychopharmacology 1998
and 5 more in the library