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The present study compared 29 current ecstasy users, 10 previous users and 46 non\u2010users on two tests measuring information processing speed and a computation span task measuring working memory. Results showed that ecstasy users performed worse than non\u2010ecstasy users in the letter comparison task although the overall difference was not significant (<jats:italic>p<\/jats:italic>\u2009=\u20090.089). Results from the pattern recognition task showed that current ecstasy users produced significantly more errors than the other two groups (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.01). When results were combined for both the letter and pattern tasks, once again current ecstasy users produced significantly more errors than non\u2010ecstasy users (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.01). Working memory deficits obtained were statistically significant with both ecstasy using groups performing significantly worse than non\u2010users on the computation span measure (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.01). Moreover, ANCOVA with measures of processing speed as covariates failed to eliminate the group difference in computation span (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.01). 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\u2010related 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. Copyright \u00a9 2007 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/hup.827","type":"journal-article","created":{"date-parts":[[2007,2,12]],"date-time":"2007-02-12T14:11:59Z","timestamp":1171289519000},"page":"81-88","source":"Crossref","is-referenced-by-count":13,"title":["Information processing speed in ecstasy (MDMA) users"],"prefix":"10.1002","volume":"22","author":[{"given":"Michelle","family":"Wareing","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John E.","family":"Fisk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Catharine","family":"Montgomery","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philip N.","family":"Murphy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin 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