Background: Williams syndrome (WS) is associated with a distinct cognitive-behavioural phenotype including mild to moderate intellectual disability, visual-spatial deficits, hypersociability, inattention and anxiety. Researchers typically characterise samples of individuals with WS by their intellectual functioning and adaptive behaviour. Because…

Background: The finding of positive outcomes at the group level for children with autism spectrum disorder (ASD) who complete comprehensive early intervention programmes often masks considerable individual variability. We therefore aimed to identify subgroups of children based on their response to intervention and to compare outcome variables…

Background: While a number of studies have examined the development of skills in children with intellectual disabilities (ID), most have been cross-sectional, most have been concerned with particular syndromes such as Down's syndrome or autism and few have attempted to identify factors associated with improvements in skills. Methods: From a sample…