Mechanisms of Rumination Change in Adolescent Depression

This study is investigating the brain mechanisms behind rumination (repetitive negative thinking, which is a key feature of depression) in teenagers who have had depression, to understand what drives this pattern and how it can be changed by different types of therapy. **You may be eligible if...** - You are between 14 and 17 years old - You have previously been diagnosed with major depressive disorder and are now in full or partial remission (feeling somewhat better for at least two weeks) - You score above average on a questionnaire measuring rumination (repetitive negative thinking) - You have a parent or guardian willing to give consent, and you are willing to give assent to participate - You have an IQ above 75 (assessed during screening) - You have gone through puberty **You may NOT be eligible if...** - You are currently experiencing suicidal thoughts with a plan or intent to act on them, or have in the past three months - You have a history of conduct disorder, autism, psychosis, or bipolar disorder - You have had an eating disorder or substance use problem in the past 6 months Talk to your doctor to see if this trial is right for you.