in the DSM-IV-TR, a residual class consisting of pervasive growth-related disorders marked by handicapped growth of cultural interaction skills correlated with communication problems or stereotypical actions which don't adapt to the diagnostic standards of other pervasive growth-related disorders, like rett syndrome, Asperger's disorder, autistic disorder, or childhood disintegrative disorder. This class consists of atypical autism, a disorder wherein kids have significant difficulties in play, non-verbal correspondence, cultural interaction, and talking but are more social than peers diagnosed with autistic disorder.