<qa>  What is the purpose of this study?The purpose of this study is to determine whether drug-dependent adults who participate in a dual processing relapse prevention treatment protocol that allows for sensory-based exposure experiences over 10-weeks in outpatient treatment will show significant brain change related to diminished cue reactivity, and greater improvement in self-efficacy, anxiety, somatization, and treatment retention, as compared to the standard care patients in a relapse prevention program. 