Autism Spectrum Disorder (ASD) are a group of pervasive developmentaldisorders affecting the child, the commonest of which is Autism, which ischaracterized by severely compromised ability to engage in, and by a lackof interest in, social interactions. All children with autism demonstratedeficits in social interaction, verbal and nonverbal communication, andrepetitive behaviors or interests. In addition, they often have unusualresponses to sensory experiences such as certain sounds. ASD has roots inboth structural brain abnormalities and genetic predispositions, accordingto family studies and studies of brain anatomy.Cognitive deficits in social perception likely result from abnormalities inneural circuitry. Children with ASD have been studied with severalimaging techniques, but no strongly consistent findings have emerged,although abnormalities in the cerebellum and limbic system and largerbrains have been reported.