Feeling anxious, stressed, or worried? Sad, down, or uninterested? Are you between the ages of 18 and 55? You may be eligible for a study examining a behavioral treatment designed to improve positive emotions, behaviors, and related brain functioning. Participants will be asked to complete a clinical interview, questionnaires, computer tasks, behavioral assessments, a behavioral treatment, and a Magnetic Resonance Brain Imaging (MRI) assessment to obtain a picture of your brain. Compensation is provided. For more information, please contact The Positive Emotion & Anxiety Research Laboratory at 858-534-6407.