The United States has approved a compound derived from marijuana as a treatment for certain types of epilepsy. The ruling may spell good news for autism research.

Children who have a rare extra copy of one segment on chromosome 15 have better cognitive abilities and daily living skills than those with a duplication that forms an extra chromosome.

More than half of people on the spectrum have four to five other conditions. Which conditions, and how and when they appear, varies from one autistic person to the next.

Over the past year, HNRNPU, a gene well known for its link to epilepsy, has emerged as a new autism candidate.

A huge new research collaboration may jump-start the race to develop therapies for autism.

About 10 percent of people with a large mutation in chromosome 22 have autism, attention deficit hyperactivity disorder or intellectual disability.

Seizures early in life may render brain circuits incapable of supporting learning during critical developmental periods.