Autism is both a medical condition that can give rise to disability and an example of human neurological variation ('neurodiversity') that contributes to identity, with cognitive assets and challenges. We refer to this as the dual nature of autism. Enhancing adaptation and wellbeing is the ultimate goal for intervention/support. Evidence-based support for autistic people across the lifespan is emerging. Support should be collaborative between autistic individuals, their families, and service providers, taking a shared decision-making approach. To maximize the individual's potential, comprehensive early intervention and parent-mediated intervention, ideally taking a naturalistic approach, may help support the early development of adaptive, cognitive and language skills. Key words: autism, support, intervention, treatment, adaptation, development, lifespan, health, disability, neurodiversity OSF preprint first posted online July 19, 2018; https://dx.doi.org/10.31219/osf.io/8z5rv The copyright holders for this preprint (which was not peer-reviewed) are the authors
Lai et al. (2018) Evidence-based support for autistic people across the lifespan
3The duality of autism Autism spectrum disorder/conditions (ASD or ASC (Lai and Baron-Cohen, 2015), henceforth 'autism') are atypical neurodevelopmental conditions that emerge early in life (Varcin and Jeste, 2017), with strong genetic aetiologies (Tick et al., 2016) shaped by subsequent gene-environmental interplays (Mandy and Lai, 2016). Autism has lifespan impact on an individual's development and adaptation (Howlin and Magiati, 2017). As a result of evolving diagnostic concepts, recognition of the spectrum and its multi-subgroup nature (Lai et al., 2013), along with increased awareness (Liu et al., 2010), autismformerly regarded as rare -is now considered relatively common. Globally, close to 1% of the population has a formal autism diagnosis (Baxter et al., 2015). In developed countries the prevalence is close to 1·5% (Lyall et al., 2017), with a male:female ratio of 3-4:1 (Loomes et al., 2017).Characteristics associated with autism (ie, 'autistic traits') fall along a spectrum in the general population across dimensions of social-communication, repetitive and stereotyped behaviours, and other non-clinical and cognitive features (Constantino et al., 2010, Ruzich et al., 2015, Skuse et al., 2009. Elevated autistic traits are particularly common in family members of people who have an autism diagnosis (Pickles et al., 2000, Piven et al., 1997, Wheelwright et al., 2010. Both clinical autism and the dimensional traits are associated with the additive effect of common and rare genetic variations (Geschwind and State, 2015, Robinson et al., 2016, Weiner et al., 2017, although their exact causal roles remain unclear.The dimensional nature of autistic traits makes it challenging to draw a clear diagnostic line, especially when genetic or other diagnostic biomarkers are not yet available (Constantino and Charman, 2016). From a medical perspective, a clinical diagnosi...