A single seizure early in life leads to enduring behavioral problems, including diminished sociability, in mice.

A new survey suggests autism prevalence has more than doubled over nine years, but the numbers may reflect only a rise in awareness and better data collection.

Certain patterns of electrical activity in the brain may signal autism in children with tuberous sclerosis complex, a related genetic condition.

Being anemic while pregnant may increase a woman’s chance of having a child with intellectual disability, autism or attention deficit hyperactivity disorder.

The loss of 21 genes on chromosome 3 may substantially raise the risk of autism.

People on the spectrum, and girls and women in particular, are at high risk of suicide; siblings of autistic people are also at heightened risk.

Families of children with mutations in a gene called SYNGAP1 have spurred research into the effects of the mutations on people — and how to treat them.

The lack of people with intellectual disability in studies of autism has a profound effect on our understanding of the condition.

A website called GeneMatcher has helped researchers identify a new gene for intellectual disability, developmental delay and autism.

Children in families with a history of brain conditions may be at increased odds of being autistic.