We are investigating Ritalin's role in alleviating symptoms of depersonalization-derealization (DPDR) disorder, which results from psychological trauma. Currently there is only one case study that has investigated the stimulant class's potential usefulness, reporting an abatement of DPDR symptoms after 4 months. We hypothesize that Ritalin will significantly alleviate DPDR symptoms in participants, particularly those with co-morbid ADHD.