https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071023/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071023/ > Although initially it proved difficult to find an

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071023/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071023/ > Although initially it proved difficult to find any cognitive sequelae that correlated with these changes,11 recent animal studies have shown subtle, but lasting, deficits in cognitive behaviorsthat do correlate with the levels of damage to 5-HT systems in the hippocampus. https://www.frontiersin.org/articles/10.3389/fnins.2015.00445/full https://www.frontiersin.org/articles/10.3389/fnins.2015.0044... > In this study, we found an MDMA-related decline in memory performance on a visual paired association test in the first follow-up period in heavy MDMA users,