Tangible User Interfaces (TUIs) offer the potential for new modes of social interaction for children with Autism Spectrum Conditions (ASC). Familiar objects that are embedded with digital technology may help children with autism understand the actions of others by providing feedback that is logical and predictable. Objects that move, playback sound or create sound – thus repeating programmed effects – offer an exciting way for children to investigate objects and their effects. This thesis presents three studies of children with autism interacting with objects augmented with digital technology. Study one looked at Topobo, a construction toy augmented with kinetic memory. Children played with Topobo in groups of three of either Typically Developing (TD) or ASC children. The children were given a construction task, and were also allowed to play with the construction sets with no task. Topobo in the task condition showed an overall significant effect for more onlooker, cooperative, parallel, and less solitary behaviour. For ASC children significantly less solitary and more parallel behaviour was recorded than other play states. In study two, an Augmented Knights Castle (AKC) playset was presented to children with ASC. The task condition was extended to allow children to configure the playset with sound. A significant effect in a small sample was found for configuration of the AKC, leading to less solitary behaviour, and more cooperative behaviour. Compared to non-digital play, the AKC showed reduction of solitary behaviour because of augmentation. Qualitative analysis showed further differences in learning phase, user content, behaviour oriented to other children, and system responsiveness. Tangible musical blocks (‘d-touch') in study three focused on the task. TD and ASC children were presented with a guided/non-guided task in pairs, to isolate effects of augmentation. Significant effects were found for an increase in cooperative symbolic play in the guided condition, and more solitary functional play was found in the unguided condition. Qualitative analysis highlighted differences in understanding blocks and block representation, exploratory and expressive play, understanding of shared space and understanding of the system. These studies suggest that the structure of the task conducted with TUIs may be an important factor for children's use. When the task is undefined, play tends to lose structure and the benefits of TUIs decline. Tangible technology needs to be used in an appropriately structured manner with close coupling (the distance between digital housing and digital effect), and works best when objects are presented in familiar form.

The overarching goal of this thesis was to examine sibling relationship quality in young twin children, as well as the ways in which this key bond is associated with other familial relationships within the home environment. The three articles included were part of a longitudinal and multi-method study, run by myself and my colleague - the Twins, Family and Behaviour study. Accounts were collected from 282 mothers and 132 fathers of twins, over a two-year time period. Parents completed postal questionnaires and a telephone interview, and observations via Skype recorded them interacting with each of their children. The research was unique, as it employed a number of novel measures and sophisticated analyses that have not yet been used within a longitudinal twin sample such as this. Results showed that, contrary to expectations, no mean level differences emerged when monozygotic twin pairs, dizygotic twin pairs, and non-twin pairs were compared on their sibling relationship quality (Paper 1). Behavioural genetic modelling also revealed that sibling interactions were mainly influenced by the shared environment, common to both children within the dyad, but also by the genetic propensities of the siblings themselves (Paper 1). Using the innovative Preschool Five Minute Speech Sample interview, we found that mothers who expressed more family-wide positive, and less family-wide negative, emotion towards their children reported more positivity within the sibling relationship – even when controlling for questionnaire measures of the mother-child relationship (Paper 2). Finally, opposing the majority of past literature, cross-lagged tests evidenced that earlier positivity within the sibling bond was predictive of later marital satisfaction, and of positivity within both the mother-child and the father-child bond (Paper 3). The implications of the findings include: the generalisability of studies of twins in childhood to the wider non-twin sibling population (Paper 1); the usefulness of maternal speech sample measures in capturing unique variance in sibling relationship quality (Paper 2); and the impact of affectionate sibling exchanges on entire family systems (Paper 3). Future research would benefit from exploring the nature of the relationship between twin brothers and sisters further, using both younger and older children's reports of their family interactions, within a more ethnically and socioeconomically diverse sample.

This thesis examines language alignment in children with an autism spectrum disorder (ASD), a neurodevelopmental disorder characterised by impaired social understanding and poor communication skills. Alignment, the tendency for speakers to repeat one another's linguistic choices in conversation, promotes better communication and more satisfying interactions (cf. e.g., Fusaroli et al., 2012). By corollary, deficits in alignment may adversely affect both communicative and affective aspects of conversation. Across three studies, I consider whether ASD children's conversational deficits relate to disrupted patterns of alignment, and explore the mechanisms underlying this. In the first study, I adopt a corpus-based approach to show that syntactic alignment effects are observable in ASD children's ‘real-life' conversations, not just in an experimental context. The second study draws on research into the role of inhibitory control in communicative perspective-taking (Nilsen & Graham, 2009) to show that lexical alignment is not socially mediated in ASD. I develop this work in the third study, which highlights how, for ASD children, conversation can be compromised when lexical alignment is driven exclusively by priming mechanisms. Taken together, these studies advance our understanding of conversational deficits in ASD, and particularly how impaired social understanding affects ASD children's language processing in dialogue. I conclude that, while ASD children have intact alignment, reduced social understanding may prevent them from ‘diverging', which can be necessary to move a conversation forward (Healey, Purver, & Howes, 2014). More broadly, the thesis addresses questions of theoretical relevance to the study of alignment, by clarifying the contributions of unmediated (i.e., priming) and socially mediated (i.e., audience design) mechanisms to children's alignment behaviour, both in ASD and typical development.

Thesis (Ph.D.)--University of Wollongong, 2006. / Typescript. Includes bibliographical references: leaf 158-178.

Thesis (MA (Counselling Psychology))--University of Pretoria, 2007. / Includes bibliographical references. Available on the Internet via the World Wide Web.

Thesis (M.Soc.Sc.)--University of Hong Kong, 1998. / Includes bibliographical references. Also available in print.

Thesis (Ed. D.)--Illinois State University, 2004. / Title from title page screen, viewed Jan. 6, 2005. Dissertation Committee: Dent M. Rhodes (chair), Cathy Toll, Donna Adair Breault. Includes bibliographical references (leaves 199-213) and abstract. Also available in print.

Thesis (M.S.)--University of Michigan, 1984.

Thesis (M.S.)--University of Michigan, 1969.

Thesis (M.S.)--University of Michigan, 1969.