The hallmark autism trait has multiple facets, Uljarević and his colleagues have found.

This collection of Spectrum stories explores some of the evolving debates, challenges and methods used to make an autism diagnosis.

The nation needs to build capacity to support the roughly 20 percent of children in Australia who have developmental delay.

Changes to the DSM-5’s diagnostic criteria for autism were meant to add clarity, but they also generated new questions.

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

Two new words and a text swap in the American Psychiatric Association’s diagnostic “bible” are unlikely to affect clinical practice, experts say.

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

Some people who have lost the diagnosis of Asperger syndrome say they feel a loss of identity and worry about a loss of services.

Doctors often conflate autism and intellectual disability, and no wonder: The biological distinction between them is murky. Scientific progress depends on knowing where the conditions intersect — and part ways.

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