People with autism show significant improvements in cognitive ability from age 12 to 23 years, but their autism traits remain stable over this time.

A new study has found that 0.2 percent of children in Oman are on the autism spectrum — an estimate about 15 times higher than the previous one.

Here is a roundup of news and research for the week of 27 January.

Restricted interests and repetitive behaviors constitute one of two criteria that define autism in the diagnostic manual for psychiatry.

The long fibers of neurons in the brains of young children with autism are structured differently from those of their neurotypical peers — and from those of older children with the condition.

Older men and women are more likely than young ones to have a child with autism, but this connection is not straightforward.

Siblings of autistic children, like those with the condition, tend to have faces that are more masculine than average.

A new analysis hints at the source of the rampant inconsistency among brain imaging studies in autism: significant differences among study sites.