Age

18–37

Sex

ALL

Healthy volunteers

Not accepted

1. Diagnosed with a psychosis spectrum disorder (ICD-10 F2x)
2. At least 8 months left of their OPUS treatment
3. The presence of rumination behavior as assessed by a score of minimum 30 on the Perseverative Thinking Questionnaire (PTQ)
4. Danish-speaking

1. Substance abuse or positive symptoms that make participation in therapy difficult
2. Severe suicidal thoughts/behavior
3. Lacks capacity to consent
4. Mild, moderate, or severe intellectual disability (IQ ˂ 70)
5. Planned adjustment of antidepressant and/or antipsychotic treatment (noted in the patient's medical record)

RUFUS - Group Rumination-focused CBT for Negative Symptoms