The growth differences vary between autistic boys and girls and are most apparent among children with prominent social difficulties.

Almost 60 percent of autistic people may have an average or above-average intelligence quotient, according to a new longitudinal study.

The bulk of the increase in autism prevalence stems from a growing awareness of the condition and changes to the diagnostic criteria.

Less than 1 percent of young children in northern Vietnam have autism, but this prevalence is higher than in previous reports.

The network of researchers keeping tabs on autism prevalence in U.S. children plans to follow up with some of those children in adolescence.

A researcher proposes splitting autism into subtypes, mitochondria make neurotransmitters, and highly successful grantees may face a funding cap.

The strict definition of autism in the latest version of the diagnostic manual is antithetical to the idea that autism comes in a wide variety of forms.

From a form of childhood schizophrenia to a spectrum of conditions, the characterization of autism in diagnostic manuals has a complicated history.

Our concept of autism has evolved over the past 20 years, rendering redundant the diagnostic labels of Asperger syndrome and pervasive developmental disorder-not otherwise specified.

Five years after its latest revision, the manual used to diagnose autism is back under scrutiny, as evidence suggests it excludes some people on the spectrum.