Despite that stereotyped and repetitive behaviors are a core symptom domain of ASD, behavioral pharmacology approaches to date have only evaluated the correlated symptoms of aggression, self-injurious, and destructive behaviors in ASD. Repetitive behaviors in ASD include stereotypic movements, repetition of routine behaviors, repetitive play, perseverative speech, and over-focus on restricted interests. These repetitive movements may be associated with emotional distress, tension, or dysphoria and have significant impacts on daily life. It is believed that the methods used to elucidate and specify treatment effects in other medications and disorders will also be valuable to the understanding of SSRI effects in autism.