Think autism and an image of an awkward boy typically emerges, but the way autism strikes girls — or doesn't — may help reveal some of the developmental disorder's frustrating secrets.
Autism is at least four times more common in boys, but scientists taking a closer look are finding some gender-based surprises: Many girls with autism have social skills that can mask the condition. And some girls do not show symptoms of autism even when they have the same genetic mutations seen in boys with the condition.
"Autism may not be the same thing in boys and girls," said Kevin Pelphrey, an autism researcher at George Washington University.
The causes of...