Women with autism show fewer repetitive behaviors than men with the condition on a standard diagnostic test, leading to possible underdiagnoses.

Children with autism fear the unknown and react negatively when faced with unpredictable situations. This intolerance of uncertainty is closely tied to anxiety but may manifest independently.

Preschool-age children with autism who have severe repetitive behaviors and intensely restricted interests tend to lag intellectually and struggle with daily living skills later on.

Headlines about “autistic monkeys” are missing the point, prairie voles show empathy, and dogs could offer clues to psychiatric conditions in people.

Monkeys with multiple copies of a gene called MeCP2 show behaviors reminiscent of autism, but some experts question the model’s value.

Two seemingly similar mutations in the SHANK3 gene have divergent effects on the brain and behavior.

The largest study of people with autism and obsessive-compulsive disorder to date adds to mounting evidence that the two conditions share genetic roots.