Parents and siblings of people with autism have abnormal eye movements and score higher on tests evaluating traits associated with the disorder.
Diagnosing autism is an evolving science but a crucial first step to understanding the disorder.
A common variation within a region on chromosome 16 puts a large proportion of the general population at risk for intellectual disability, according to a study published in August in Nature Genetics.
Changes in diagnostic practices, more active neighborhood networks, and an increase in the number of older parents may all contribute to the massive rates of autism in California, says a group of social scientists. But the numbers still don’t add up.