a variable developmental disorder that appears by age three and is characterized especially by difficulties in forming and maintaining social relationships, by impairment of the ability to communicate verbally or nonverbally, and by repetitive behavior patterns and restricted interests and activities, developmental disorder affecting physical, social, and language skills, with an onset of signs and symptoms typically before age three, geneetiline neurovariatsioon, [mis] annab omapärase ning ebatüüpilise mõtlemis-, liikumis- ja suhtlemisviisi ning sensoorse ja kognitiivse info töötlemise viisi