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Visuospatial memory impairments in users of MDMA ('ecstasy')
Michelle Wareing1, Philip N Murphy, John E Fisk
1Centre for Studies in the Social Sciences, Edge Hill, St. Helens Road, Ormskirk, Lancashire, L39 4QP, UK.
Psychopharmacology
|January 22, 2004
Summary
MDMA (ecstasy) users show deficits in visuospatial working memory, impacting their ability to recall spatial sequences. Performance was worse than non-users, regardless of task complexity.
Area of Science:
- Neuroscience
- Psychology
Background:
- Conflicting findings exist on visuospatial span deficits in MDMA users.
- Distinguishing between simple visuospatial span and working memory is crucial.
- Visuospatial working memory involves central executive and concurrent processing.
Purpose of the Study:
- Compare visuospatial working memory span in MDMA users and controls.
- Investigate central executive workload differences using a concurrent task.
Main Methods:
- Between-participants design: MDMA users (current/previous) vs. non-users.
- Within-participants design: Dual task (alphabetic/random generation) vs. no dual task.
- Visuospatial working memory task: Serial spatial recall with concurrent visual judgment.
Main Results:
- Non-users outperformed both MDMA user groups.
- MDMA's impact on performance persisted after controlling for confounds like intelligence and other drug use.
- No significant interaction found between dual task condition and user group.
Conclusions:
- MDMA users exhibit visuospatial working memory deficits.
- Inter-group differences in central executive utilization may explain the lack of dual task interaction.