Early features of other conditions may contribute to autism itself
Harmful mutations in a gene called NAA15 may lead to autism, intellectual disability and delayed speech and motor function.
A widely used test for autism misses some children with delays in motor, social and communication skills.
The proportion of studies that include people with a severe form of autism has fallen over the past three decades.
Children with autism who speak few words and have trouble manipulating objects tend to remain minimally verbal as they reach adulthood.
Language difficulties and emotional challenges such as anxiety or aggression in children with autism at age 3 predict their social skills at around age 5.
People on the spectrum often have subtle problems using language or making facial expressions. Pinpointing where those difficulties originate may help ease their social communication.
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