Previous research draws parallels between ecstasy-related and age-related deficits in cognitive functioning. Age-related impairments in working memory have been attributed to a slow down in information processing speed. The present study compared 29 current ecstasy users, 10 previous users and 46 non-users on two tests measuring information processing speed and a computation span task measuring working memory. Results showed that ecstasy users performed worse than non-ecstasy users in the letter comparison task although the overall difference was not significant (p = 0.089). Results from the pattern recognition task showed that current ecstasy users produced significantly more errors than the other two groups (p < 0.01). When results were combined for both the letter and pattern tasks, once again current ecstasy users produced significantly more errors than non-ecstasy users (p < 0.01). Working memory deficits obtained were statistically significant with both ecstasy using groups performing significantly worse than non-users on the computation span measure (p < 0.01). Moreover, ANCOVA with measures of processing speed as covariates failed to eliminate the group difference in computation span (p < 0.01). Therefore, it is likely the mechanism responsible for impairments in the computation span measure is not the same as that in elderly adults where processing speed generally removes most of the age-related variance. Also of relevance is the fact that the ecstasy users reported here had used a range of other drugs making it difficult to unambiguously attribute the results obtained to ecstasy use.
|Journal||Human Psychopharmacology: Clinical and Experimental|
|Publication status||Published - 12 Feb 2007|
Wareing, M., Fisk, J., Montgomery, C., Murphy, P., & Chandler, M. (2007). Information Processing Speed in Ecstasy (MDMA) Users. Human Psychopharmacology: Clinical and Experimental, 22(2), 81-88. https://doi.org/10.1002/hup.827