The main goal of the study is to look at the effects of intranasal oxytocin on the brain in
Autism Spectrum Disorder (ASD). Oxytocin is a hormone that exists naturally in the body and
the brain, affecting a wide range of social behaviors and emotions. The investigators will
study the effects of different treatments (3 doses of oxytocin and one dose of placebo) on
brain functional connectivity at rest in patients with ASD, using functional magnetic
resonance imaging (fMRI). Investigators also seek to study how the effects of oxytocin
treatment can be affected by genetic, immune and environmental factors.