<unk>  (LFA) is a degree of autism marked by difficulties with social communication and interaction, challenging behavior, and differences in social or emotional reciprocity. Sleep problems, aggression, stereotypy and self-injurious behavior are also common symptoms. LFA is not a recognized diagnosis in the DSM-5 or ICD-10, as neither subdivides autism based on intellectual capabilities. Other terms include Kanner's syndrome, Kannerian autism and classic autism. The terms overlap with severe autism and profound autism (as opposed to "mild" or "moderate"), which do not necessarily correlate with severe and profound levels of intellectual disability (where profound is the most severe level).
Low-functioning autism
High-functioning autism
Nonverbal autism
Autism spectrum
Multiple complex developmental disorder
Conduct disorder
Selective mutism
Pervasive developmental disorder