Subjects must sign a consent form to take part in this study. Their participation in the study will last up to 14-15 weeks. Prospective subjects will be recruited from the community through advertisements (radio, social media, mass emails, etc). Those who respond to advertisements will undergo initial screening over the phone. Prospective subjects who appear to meet study criteria based on the phone screen will give informed consent and undergo more detailed evaluation during a screening clinic visit. If they are found to meet study criteria, they will shortly thereafter attend another clinic visit (randomization clinic visit) during which they will be randomized to oxytocin or placebo treatment and take their first test dose under study personnel supervision. They will then take home the bottle contained the intranasal study medication to which they have been randomized and self-administer intranasal test doses at home for the remainder of the 12-week test treatment period. New intranasal spray bottles will be exchanged for old every 2 weeks. Subjects will attend 8 additional clinic visits over a 12 week period after the randomization clinic visit. Each clinic visit will last 1-2 hours.