Children with autism spectrum disorder (ASD) display severe disruptions in communication and social interaction. There are many widely implemented but unproven treatments that are thought to improve these skills. Sensory integration deficit (SID) is a controversial but widely used diagnostic classification in ASD and sensory integration based treatment (SIT) is now routinely provided to children with ASD but has an extremely limited evidence base. The purpose of this project is to evaluate whether sensory integration treatment is associated with improvements in communication and social skills in children with ASD. Pre-and post intervention behavioral and neuroimaging measures of multi-sensory processing will be gathered and analyzed to determine whether changes in multi-sensory processing are associated with SIT intervention.