Arousal-Biofeedback for the Treatment of Aggressive Behavior in Children and Adolescents

Inclusion Criteria (interventional group): * ODD/CD diagnosis based on the DSM-5 criteria * aggression in the clinical range, T \> 70 on the aggression or delinquency subscale of the Teacher Report Form (TRF), Youth Self Report (YSR) or Child Behaviour Checklist (CBCL) * Preferably medication-naive, otherwise medication should be stable for at least 2 months Inclusion Criteria (typically developing (TD) control group): * No diagnosis based on the DSM-5 criteria * aggression below clinical range, T \< 70 on the aggression or delinquency subscale of the Teacher Report Form (TRF), Youth Self Report (YSR) or Child Behaviour Checklist (CBCL) Exclusion Criteria (both groups): * IQ\<80 * a primary DSM-5 diagnosis of psychosis, bipolar disorder, depression or anxiety * contra-indications for MRI scanning, e.g. presence of metal parts in the body * epilepsy