Comparing the effects of mindfulness-based cognitive therapy and psychoeducational therapy on symptomatology and neurophysiological correlates of adult attention deficit hyperactivity disorder (ADHD)

INTERVENTION: Intervention 1: Mindfulness‐based group psychotherapy for adult ADHD Duration: 8 weekly meetings, lasting 2.5 hours each Intervention 2: Psychoeducative group psychotherapy for adult ADHD Duration: 8 weekly meetings, lasting 2.5 hours each CONDITION: Adult attention deficit hyperactivity disorder (ADHD) ; Mental and Behavioural Disorders ; Disturbance of activity and attention PRIMARY OUTCOME: 1. ADHD symptomatology, measured using Conners Adult ADHD Rating Scale‐Observer [Inattention Scale (A) and Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM‐IV) ADHD‐ Overall Symptoms (G)] in week 0, week 8, and month 8; 2. Neurobiological correlates: activity in caudate nucleus measured using functional magnetic resonance imaging (fMRI) in week 0, week 8, and month 8 SECONDARY OUTCOME: 1. Severity of depression, measured using Beck Depression Inventory II in week 0, week 8, and month 8; 2. General psychpathology, measured using Symptom Check List‐ 90‐ revised in week 0, week 8, and month 8; 3. Quality of life, measured using the German version of Short‐Form 36 questionnaire in week 0, week 8, and month 8; 4. Mindfulness, measured using the Five‐Facet Mindfulness Questionnaire in week 0, week 8, and month 8; 5. Nicotine dependence, measured using Fagerström Nicotine Dependence Test in week 0, week 8, and month 8; 6. Caffeine consumption, recorded through single item in blind external assessment in week 0, week 8, and month 8; 7. Extent of behavioral addiction, recorded through single item in blind external assessment in week 0, week 8, and month 8 INCLUSION CRITERIA: 1. Men and women 2. First language German or comparable level 3. At least 18 years old, at most 65 years old 4. Diagnosed with ADHD (through a doctor or psychologist) 5. Wender Utah Rating Scale (WURS)‐Score of at least 30 6. Subject?s consent in written form 7. Unlimited legal competency