Here’s part of the DSM-IV TR criteria:
Social Impairment, such as:
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
Lack of spontaneous seeking to share enjoyment, interest, or achievements with other people
Lack of social or emotional reciprocity.
Impairments in communication:
Delay in or total lack of the development of spoken language (not accompanied by an attempt to compensate through alternative modes of communication such as gesture of mime)
In individuals with adequate speech, marked impairment in the ability to initiate to sustain a conversation with others
Stereotyped and repetitive use of language or idiosyncratic language
Lack of varied, spontaneous make-believe play or social imitative play appropriate to developmental level
Restricted repetitive and stereotyped patterns of behavior, interests, and activities:
Encompassing preoccupation with one or more stereotyped and restricted patterns of interest that is abnormal either in intensity or focus
Apparently inflexible adherence to specific, nonfunctional routines or rituals
Stereotyped and repetitive motor mannerisms (hand flapping, complex whole body movements, spinning)
Persistent preoccupation with parts of objects
Delays or abnormal functioning start before the age of 3.
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