Despite the similarities observed between the fragile X syndrome (FXS) and autism spectrum disorder (ASD) phenotypes, few studies have compared their behavioral profiles outside of ASD symptomatology. In the present study, we sought to compare lexical and grammatical abilities in these two conditions. Comparisons of language abilities in both of these conditions are particularly interesting because both conditions are characterized by difficulties navigating social interactions. Results suggest that although both FXS and ASD are associated with language difficulties, there are important differences between the two conditions in terms of the language profiles observed and the factors influencing language when considering children of similar developmental levels. Theoretical implications are discussed.

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Social inclusion of individuals with intellectual and developmental disabilities (IDD) is related to positive mental health and social outcomes; yet, individuals with IDD experience societal barriers that limit opportunities for community participation. Providing opportunities for interactions between individuals with and without IDD through peer mentoring may diminish barriers and improve community inclusion. Guided by the self‐determination theory, the current report describes the development of a peer mentoring programme to promote the natural process of building intrinsic motivation and personal growth through opportunities for individuals without disabilities to socialize with individuals with IDD on a large university campus and throughout the surrounding community. The theoretical framework that informed the development of the peer mentoring programme is described, as well as the participants, the setting in which the programme is situated, the structure of the programme, the initial impacts and improvement of the programme over time, including approaches to sustainability, and implications for future research and practice.

Although it is well-known that individuals with intellectual and developmental disabilities (IDD) are socially vulnerable, the field lacks valid assessments to identify risk factors for victimization. Parents/caregivers of 428 individuals with IDD (ages 12-53) completed the social vulnerability questionnaire (SVQ), a measure developed to assess specific aspects of social vulnerability among individuals with various forms of IDD. This study examined the psychometric structure of the SVQ (exploratory and confirmatory factor analysis), and the utility of the factors of the SVQ as predictors of diagnostic category (through discriminate function analysis). Results provide psychometric support for use of the SVQ and its factors for further research and as part of a clinical assessment battery to assess social vulnerability and to develop interventions.

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