They hypothesize that ecstasy depletes serotonin in areas of the brain responsible for verbal recall and verbal recognition. They also speculate this could be reversible. They found no difference in drug effects been males and females.
"Science Daily — Even low doses of Ecstasy may be associated with a decline in language-related memory, according to a report in the June issue of Archives of General Psychiatry, one of the JAMA/Archives journals."
"In conclusion, our data indicate that low doses of Ecstasy are associated with decreased verbal memory function, which is suggestive for Ecstasy-induced neurotoxicity," the authors conclude. "Further research on the long-term effects of Ecstasy as well as on the possibility of additive effects of Ecstasy use on aging of the brain is needed."http://www.sciencedaily.com/releases/2007/06/070604164938.htm