NIH - Medical Encyclopedia Autism

"Most parents of autistic children suspect that something is wrong by the time the child is 18 months old and seek help by the time the child is 2. Children with autism typically have difficulties in verbal and nonverbal communication, social interactions, and pretend play. In some, aggression -- toward others or self -- may be present. Some children with autism appear normal before age 1 or 2 and then suddenly "regress" and lose language or social skills they had previously gained. This is called the regressive type of autism. People with autism may perform repeated body movements, show unusual attachments to objects or have unusual distress when routines are changed. Individuals may also experience sensitivities in the senses …"

NIH - Medical Encyclopedia Asperger syndrome

"The child with Asperger shows below-average nonverbal communication gestures, fails to develop peer relationships, has an inability to express pleasure in other people's happiness, and lacks the ability to reciprocate emotionally in normal social interactions. The condition appears to be more common in boys than in girls. There are likely genetic factors, but some theories suggest a prenatal infection may be to blame. While people with Asperger syndrome are frequently socially inept, many have above-average intelligence, and they may excel in fields like computer programming and science. There is no delay in cognitive development, in the development of age-appropriate self-help skills, or in curiosity about the environment. Generally, there is no language development delay."

Highlighted Articles

A Prospective Study of Response to Name in Infants at Risk for Autism (Arch Pediatr Adolesc Med 2007)

"Conclusions Failure to respond to name by age 12 months is highly suggestive of developmental abnormality but does not identify all children at risk for developmental problems. Lack of responding to name is not universal among infants later diagnosed with ASD and/or other developmental delays. Poor response to name may be a trait of the broader autism phenotype in infancy."

Structure of the Autism Symptom Phenotype: A Proposed Multidimensional Model. (Journal of the American Academy of Child & Adolescent Psychiatry. 2007)

"Conclusions: The pervasive developmental disorder symptom phenotype is composed of three domains or factors: social-communication, inflexible language and behavior, and repetitive sensory and motor behavior. Each child with pervasive developmental disorder can be characterized by these dimensions, which give an informative picture of the clinical presentation and a quantitative estimate of the severity of the disability."