Why does brain development diverge from normal in autism spectrum disorders?

Rett syndrome, a neurodevelopmental disorder on the autism spectrum, is marked by relatively normal development in infancy followed by a loss of loss of cognitive, social and language skills starting at 12 to 18 months of age. What hasn't been clear is why children start out developing normally, only to become progressively abnormal. New research helps unravel what's going on.

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