Before the recent revisions to the DSM-5, Asperger's syndrome was considered to be a mild form of autism, often referred to as high-functioning autism (HFA).
In Depth:Connecticut school shooting: People with Asperger's unlikely to break the law ...
Investigators Probe For Insight Into Newtown Gunman's Mind
Several people also told the newspaper that Lanza had Asperger's syndrome, a high-functioning form of autism. “He was really quiet.