DSM-IV-TR definition of Autism:
-qualitative impairment in social interaction
-qualitative impairment in communication
-restricted, repetitive and stereotypical patterns of behavior, interests and activities
-onset in delays is very early, prior to age three.
According to DSM, impairment in social interaction is manifested in at least two of the following ways:
-marked impairment in the use of multiple nonverbal behaviors such as eye contact, facial expression, body postures, and gestures to regulate social interaction
-failure to develop peer relationships appropriate to developmental level
-a lack of spontaneous seeking to share enjoyment, interests or achievement with other people
-lack of social or emotional reciprocity