2 weeks randomized, double-blind treatment with intranasal oxytocin (24 IU daily, or 12 IU daily if the weight is < 40kg) with assessment of diagnosis, symptom profiles (the Affective Reactivity Index [ARI], Inventory of Callous-Unemotional Trait [ICU], Behavior Assessment System for Children, second version [BASC-2], and Clinical Global Impression [CGI]) and pre- and post-oxytocin treatment neuroimaging (fMRI and MEG). The genetic sample will be obtained via buccal mucosa sampling.