A widely used test for autism misses some children with delays in motor, social and communication skills.

A patent on variants in an autism gene is unlikely to hold up in court, but may still hinder research, some experts say.

Many children eventually diagnosed with autism lose social skills between 18 months and 3 years of age. But few parents notice this trend.

Pediatricians disagree with specialists 25 percent of the time on whether a child should receive an autism diagnosis.

Brain waves in infancy forecast autism, people with more autism features have trouble detecting lies, and veterinarians battle claims that vaccines cause autism in dogs.

Girls with autism may have less severe restricted and repetitive behaviors than do boys on the spectrum.