If the participants are assigned to the oxytocin treatment arm by randomization, they will be initiated on oxytocin administration after the MRI visit 1 and MEG visit 1. Following previous studies using intranasal oxytocin administration, subjects weighing >40kg will receive a total of 24 IU of oxytocin delivered as 2- 6 IU puffs to each nostril once daily. Subjects weighing <40kg will receive a total of 12 IU of oxytocin delivered as 1- 6 IU puff to each nostril daily. Participants will receive 14 to 21 days of daily oxytocin/placebo administration. After 14 days of oxytocin/placebo administration, participants will be scheduled to have MRI visit 2 and MEG visit 2. After those two visits are completed, participants will stop oxytocin/placebo administration. Participants who are assigned to placebo treatment branch will receive identical bottles and instructions for delivery of all the other ingredients of nasal spray except oxytocin. The instruction and demonstration will be given to the parents or legal guardian as the first administration of the nasal spray done at the clinic by either child and adolescent psychiatrist or advanced practice registered nurse. The daily administration will be done by dispatching either oxytocin or placebo nasal spray to the parents of the participants. The oxytocin and placebo nasal spray will be prepared by the University of Nebraska Medical Center research pharmacist who will be un-blinded to each subject's treatment assignment. The randomization will be done by the department of pharmacology by a computer-programmed randomization procedure.