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Dworzynski, Katharina; Ronald, Angelica; Hayiou-Thomas, Marianna E.; McEwan, Fiona; Happe, Francesca; Bolton, Patrick; Plomin, Robert – Infant and Child Development, 2008
Autism spectrum disorders (ASDs) are diagnosed when individuals show impairments in three behavioural domains: communication, social interactions, and repetitive, restrictive behaviours and interests (RRBIs). Recent data suggest that these three sets of behaviours are genetically heterogeneous. Early language delay is strongly associated with ASD,…
Descriptors: Twins, Delayed Speech, Autism, Asperger Syndrome