The co-occurring conditions may stem from the heightened stress people in minority communities experience.

Genetic variants that contribute to autism may also be involved in attention deficit hyperactivity disorder and Tourette syndrome, according to a new study.

Atypical development of a particular type of neuron explains the structural similarities seen in the brains of people with autism, schizophrenia and other conditions, according to a new study.

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

Some scientists say an immune condition called PANDAS affects as many as 1 in 200 children who have traits similar to those of autism. But many experts contest that figure — and even the condition’s very existence.

Autistic people have long maintained that repetitive behaviors are beneficial. Emerging evidence in support of this idea is shaping new therapies.

A tiny chunk of the brain’s emotion enter, the amygdala, is enlarged in some autistic children; the larger this piece, the more anxious and depressed the child is likely to be.

Watch the complete replay of Christine Conelea and Suma Jacob discussing the emergence of repetitive behaviors in autism and obsessive-compulsive disorder.

Autism and obsessive-compulsive disorder frequently accompany each other; Scientists are studying both to understand how they differ.

Deep brain stimulation is not an approved treatment for autism but has helped some people with extreme obsessions and other severe traits. Host Ben Kuebrich investigates one success story.