Michelle Dawson posts
Structured cited links
Rebecca J Landa, Alden L Gross, Elizabeth A Stuart, Ashley Faherty (2013). Developmental Trajectories in Children With and Without Autism Spectrum Disorders: The First 3 Years. Child Development, 84(2), 429-442. Oxford University Press (OUP).
Abstract
Abstract Retrospective studies indicate 2 major classes of autism spectrum disorder (ASD) onset: early and later, after a period of relatively healthy development. This prospective, longitudinal study examined social, language, and motor trajectories in 235 children with and without a sibling with autism, ages 6–36 months. Children were grouped as: ASD identified by 14 months, ASD identified after 14 months, and no ASD. Despite groups' initial similar developmental level at 6 months, ASD groups exhibited atypical trajectories thereafter. Impairment from 14 to 24 months was greater in the Early-ASD than the Later-ASD group, but comparable at 36 months. Developmental plateau and regression occurred in some children with ASD, regardless of timing of ASD diagnosis. Findings indicate a preclinical phase of varying duration for ASD.
Study authors in this cited reference