This study recruits young adults with childhood adversity; enrolled subjects either receive an 8-week mindfulness based intervention, or wait for 8 weeks before receiving the intervention. MRI and a battery of self report questionnaires will be administered before and after the intervention; subjects on the waiting list will undergo the same research procedures at the same time as subjects in the intervention group. Primary hypotheses include improved hippocampal plasticity, increased mindfulness and reduced stress and related psychological symptoms.