1. Picture Viewing and Emotion Regulation Task-Duration: approximately 40 minutes The subject will be presented with a number of different pictures from the International Affective Picture System (IAPS) including traditional unpleasant, neutral, and pleasant images as well as images of drugs and drug-related paraphernalia. Pictures are presented following an instruction cue asking the person to enhance (upregulate) or diminish (downregulate) their affective responses.