During each scanning session, participants will be undergoing brain scans with functional magnetic imaging (fMRI) while they perform an emotional regulation task that involves observing images possessing negative emotional valence. These images are drawn from, and have their emotional valence validated by, the International Affective Picture System (IAPS). Participants are instructed either to view passively or attempt to reduce the negative affect associated with the images. In addition, resting state brain scans will also be acquired while subjects fixate on a central cross with no explicit task. Heart rate variability will be measured during these resting state scans. The comparison of changes in brain activity during execution of the emotional regulation task (as compared to baseline scans) after receiving psychotherapy with MDMA or placebo, as well as comparison of changes in resting state functional connectivity, are the primary outcome measures. Study observations are intended to assess changes in response to emotion-provoking material at several levels, most notably brain activity in response to anxiety producing images.