Differences in brain structure may distinguish boys with relatively mild features of fragile X syndrome from those with a severe form of the condition.

Deletion of 16p11.2, a chromosomal region linked to autism, leads to the enlargement of certain brain structures, whereas duplication of the same region leads to structures that are unusually small.

A brain region that processes emotions tends to be smaller in children who have both autism and anxiety than in those who have autism alone.

Eric Courchesne is known for his findings on brain size in autism. But the roots of his long career trace back to his own childhood disability.

New software charts the crests of the folds that define the brain’s surface in people with autism.

Researchers are pushing the limits of brain imaging, looking at fetal brains for the earliest signs of autism.

Music therapy proves ineffective for autism, brain structures differ with 16p11.2 duplications and deletions, and mice missing NLGN3 may influence the sociability of their littermates.

People with autism aren’t easily surprised, the social camouflage some girls and women with autism use may preclude diagnosis, and autism-related genes are rooted deep in human ancestry.

Monkeys with a mutation in the Rett syndrome gene, MeCP2, have social difficulties and repetitive behaviors.

The evidence linking autism and maternal infections grows, special neuron recipes are in development, a CRISPR pioneer envisions unicorns, and 23andMe delivers empathy data.