The first monkey with a mutation in SHANK3, a top autism gene, is nearly 3; it spends its days circling its cage rather than interacting with other monkeys.

Traits linked to autism and attention deficit hyperactivity disorder tend to co-occur even in adulthood.

Difficulties with social communication appear to wane as toddlers with autism mature into young adults, perhaps due in large part to improvements in language ability.

David and Bernardo Sabatini, brothers born just a year and a half year apart, invent their way to answering big questions about autism.

The brain’s system for sensing pleasure and reward shows unusual activation patterns and an atypical structure in people with autism.

An app may help people with autism manage anxiety, adults on the spectrum share the items they use to self-soothe, and autistic children can pick up new words by overhearing them.

A miniature particle delivers the gene-editing tool CRISPR into the brains of fragile X mice.

Mice with a mutation in a top autism gene may have altered levels of certain gut bacteria; feeding the mice one of these bacterial species eases some of their troubles.

Girls with an autism diagnosis have more severe impairments in social communication than boys with the diagnosis.