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This thesis by publication contributes to our knowledge of psychological factors underlying a modern day phenomenon, young people’s mobile phone behaviour. Specifically, the thesis reports a PhD program of research which adopted a social psychological approach to explore mobile phone behaviour among young Australians aged between 15 and 24 years. A particular focus of the research program was to explore both the cognitive and behavioural aspects of young people’s mobile phone behaviour which for the purposes of this thesis is defined as mobile phone involvement. The research program comprised three separate stages which were developmental in nature, in that, the findings of each stage of the research program informed the next. The overarching goal of the program of research was to improve our understanding of the psychosocial factors influencing young people’s mobile phone behaviour. To achieve this overall goal, there were a number of aims to the research program which reflect the developmental nature of this thesis. Given the limited research into the mobile phone behaviour in Australia, the first two aims of the research program were to explore patterns of mobile phone behaviour among Australian youth and explore the social psychological factors relating to their mobile phone behaviour. Following this exploration, the research program sought to develop a measure which captures the cognitive and behavioural aspects of mobile phone behaviour. Finally, the research program aimed to examine and differentiate the psychosocial predictors of young people’s frequency of mobile phone use and their level of involvement with their mobile phone. Both qualitative and quantitative methodologies were used throughout the program of research. Five papers prepared during the three stages of the research program form the bulk of this thesis. The first stage of the research program was a qualitative investigation of young people’s mobile phone behaviour. Thirty-two young Australians participated in a series of focus groups in which they discussed their mobile phone behaviour. Thematic data analysis explored patterns of mobile phone behaviour among young people, developed an understanding of psychological factors influencing their use of mobile phones, and identified that symptoms of addiction were emerging in young people’s mobile phone behaviour. Two papers (Papers 1 and 2) emanated from this first stage of the research program. Paper 1 explored patterns of mobile phone behaviour and revealed that mobile phones were perceived as being highly beneficial to young people’s lives, with the ability to remain in constant contact with others being particularly valued. The paper also identified that symptoms of behavioural addiction including withdrawal, cognitive and behavioural salience, and loss of control, emerged in participants’ descriptions of their mobile phone behaviour. Paper 2 explored how young people’s need to belong and their social identity (two constructs previously unexplored in the context of mobile phone behaviour) related to their mobile phone behaviour. It was revealed that young people use their mobile phones to facilitate social attachments. Additionally, friends and peers influenced young people’s mobile phone behaviour; for example, their choice of mobile phone carrier and their most frequent type of mobile phone use. These papers laid the foundation for the further investigation of addictive patterns of behaviour and the role of social psychological factors on young people’s mobile behaviour throughout the research program. Stage 2 of the research program focussed on developing a new parsimonious measure of mobile phone behaviour, the Mobile Phone Involvement Questionnaire (MPIQ), which captured the cognitive and behavioural aspects of mobile phone use. Additionally, the stage included a preliminary exploration of factors influencing young people’s mobile phone behaviour. Participants (N = 946) completed a questionnaire which included a pool of items assessing symptoms of behavioural addiction, the uses and gratifications relating to mobile phone use, and self-identity and validation from others in the context of mobile phone behaviour. Two papers (Papers 3 & 4) emanated from the second stage of the research program. Paper 3 provided an important link between the qualitative and quantitative components of the research program. Qualitative data from Stage 1 indicated the reasons young people use their mobile phones and identified addictive characteristics present in young people’s mobile phone behaviour. Results of the quantitative study conducted in Stage 2 of the research program revealed the uses and gratifications relating to young people’s mobile phone behaviour and the effect of these gratifications on young people’s frequency of mobile phone use and three indicators of addiction, withdrawal, salience, and loss of control. Three major uses and gratifications: self (such as feeling good or as a fashion item), social (such as contacting friends), and security (such as use in an emergency) were found to underlie much of young people’s mobile phone behaviour. Self and social gratifications predicted young people’s frequency of mobile phone use and the three indicators of addiction but security gratifications did not. These results provided an important foundation for the inclusion of more specific psychosocial predictors in the later stages of the research program. Paper 4 reported the development of the mobile phone involvement questionnaire and a preliminary exploration of the effect of self-identity and validation from others on young people’s mobile phone behaviour. The MPIQ assessed a unitary construct and was a reliable measure amongst this cohort. Results found that self-identity influenced the frequency of young people’s use whereas self-identity and validation from others influenced their level of mobile phone involvement. These findings provided an important indication that, in addition to self factors, other people have a strong influence on young people’s involvement with their mobile phone and that mobile phone involvement is conceptually different to frequency of mobile phone use. Stage 3 of the research program empirically examined the psychosocial predictors of young people’s mobile behaviour and one paper, Paper 5, emanated from this stage. Young people (N = 292) from throughout Australia completed an online survey assessing the role of self-identity, ingroup norm, the need to belong, and self-esteem on their frequency of mobile phone use and their mobile phone involvement. Self-identity was the only psychosocial predictor of young people’s frequency of mobile phone use. In contrast, self-identity, ingroup norm, and need to belong all influenced young people’s level of involvement with their mobile phone. Additionally, the effect of self-esteem on young people’s mobile phone involvement was mediated by their need to belong. These results indicate that young people who perceive their mobile phone to be an integral part of their self-identity, who perceive that mobile phone is common amongst friends and peers, and who have a strong need for attachment to others, in some cases driven by a desire to enhance their self-esteem, are most likely to become highly involved with their mobile phones. Overall, this PhD program of research has provided an important contribution to our understanding of young Australians’ mobile phone behaviour. Results of the program have broadened our knowledge of factors influencing mobile phone behaviour beyond the approaches used in previous research. The use of various social psychological theories combined with a behavioural addiction framework provided a novel examination of young people’s mobile behaviour. In particular, the development of a new measure of mobile phone behaviour in the research program facilitated the differentiation of the psychosocial factors influencing frequency of young people’s mobile phone behaviour and their level of involvement with their mobile phone. Results of the research program indicate the important role that mobile phone behaviour plays in young people’s social development and also signals the characteristics of those people who may become highly involved with their mobile phone. Future research could build on this thesis by exploring whether mobile phones are affecting traditional social psychological processes and whether the results in this research program are generalisable to other cohorts and other communication technologies.

Spirituality and religiosity can play key roles in individual lives through influencing health, social relationships, political views, as well as many other facets (Newberg, D'Aquili & Rause, 2001; Milevsky & Levitt, 2004; Hirsh, Walberg & Peterson, 2013). As important as religious and spiritual beliefs are to societies, cultures, and individuals, little is known about which psychological factors determine choices of faith. Although there are likely many determinants of religious, spiritual, atheist or agnostic beliefs, this study explored four possible factors: critical thinking skills, need for cognition, need for emotional comfort/security, and need for closure. Participants included an undergraduate sample and a community sample. It was hypothesized that religious and spiritual individuals will have lower critical thinking skills, lower needs for cognition, higher needs for emotional comfort/security and higher needs for closure than agnostic and atheist individuals. Hypotheses also included potential interactions between these variables in predicting each faith path. Religiosity was measured using the I/E Religious Orientation Scale - Revised (Gorsuch & McPherson, 1989) and Spirituality was measured utilizing the Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS) (Fetzer Institute, 1999). These two faith paths were also self -reported by participants after definitions of each were provided. Atheist and Agnostic beliefs were only measured through self-report. Results indicated that both measures of logic (critical thinking skills and need for cognition) and emotional comfort/security (Need to Belong and Religious Motivations) predicted various faith paths. Limitations included sample characteristics and small numbers of Atheist and Agnostic individuals. A better understanding of the motivations for choosing either spiritual or non-spiritual paths may assist in further explanation of the multiple roles each faith choice plays in individual lives.

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How does the satisfaction (or the lack of satisfaction) of the innate need to have meaningful interpersonal relationships affects behavioural self-regulation? How does having/lacking interpersonal relatedness impact one’s perception of future interpersonal relationships? This doctoral dissertation aimed to answer these two fundamental questions by integrating the views of two complementary theories, need to belong theory (NBT; Baumeister & Leary, 1995) and self-determination theory (SDT; Deci & Ryan, 1985, 2000). Using a series of two laboratory experiments and one longitudinal study, this thesis examined the effects of social exclusion and inclusion on satisfaction of basic psychological needs, self-determined motivation, and self-regulation of behaviours. In Study 1 (N=72), social exclusion and inclusion were manipulated in order to examine their effects on the satisfaction of the three basic psychological needs proposed by SDT, that is the needs for autonomy, competence, and relatedness. Findings from this first experiment revealed that social exclusion decreases satisfaction of the three needs, whereas social inclusion increases satisfaction of these needs when compared to the control condition. Furthermore, significant differences were found between the exclusion condition and the inclusion condition for the reported levels of satisfaction of the needs for competence and relatedness. The effects of social exclusion and inclusion on basic needs satisfaction were further investigated in Study 2 (N=70); also, the second study examined how self-determined motivation and behavioural self-regulation are affected. More specifically, it tested whether participants’ persistence at a laboratory task, as well as their intentions for a future peer interaction (intentions to compete against a peer participant and intentions to collaborate with a peer participant) are influenced by social exclusion and inclusion, through the meditating effects of basic needs satisfaction and self-determined motivation. The results suggested that social exclusion, via the effects of basic needs and motivation decreases peer collaboration, whereas social inclusion was shown to have an opposite effect on peer collaboration. The effect of condition via the mediating effects of basic needs satisfaction and motivation failed to predict persistence at the task and peer competition. Lastly, Study 3 (N=624) assessed naturally occurring social exclusion and inclusion in a population of junior high school students. This third study investigated the independent contributions of SDT and NBT in the prediction of academic motivation and high school dropout. Peer relatedness, perceived needs support from parents, and perceived needs support from teachers were examined as potential predictors of academic motivation and high school dropout. Findings suggested that peer relatedness plays an important role in the prediction of academic motivation, but, that perceived needs support from parents and perceived needs support from teachers are stronger predictors of that outcome. Results from this study also revealed that peer relatedness contributes to the prediction of high school dropout, beyond what can be explained by academic motivation, perceived needs support from parents, and perceived needs support from teachers. However, perceived needs support from parents was shown to be the most essential predictor of high school dropout. In sum, findings from this doctoral dissertation suggested that social exclusion has detrimental effects on one’s motivation and behavioural self-regulation. In contrast, social inclusion fosters social support which promotes satisfaction of the basic psychological needs, self-determined motivation, and successful self-regulation. This doctoral thesis contributed to the application of SDT and NBT by comparing elements of the two complementary frameworks. It also offered an original contribution to research on social exclusion and inclusion by examining their impacts on self-determined motivation, and basic needs satisfaction, as well as testing them in both the laboratory setting and the natural setting.

How does the satisfaction (or the lack of satisfaction) of the innate need to have meaningful interpersonal relationships affects behavioural self-regulation? How does having/lacking interpersonal relatedness impact one’s perception of future interpersonal relationships? This doctoral dissertation aimed to answer these two fundamental questions by integrating the views of two complementary theories, need to belong theory (NBT; Baumeister & Leary, 1995) and self-determination theory (SDT; Deci & Ryan, 1985, 2000). Using a series of two laboratory experiments and one longitudinal study, this thesis examined the effects of social exclusion and inclusion on satisfaction of basic psychological needs, self-determined motivation, and self-regulation of behaviours. In Study 1 (N=72), social exclusion and inclusion were manipulated in order to examine their effects on the satisfaction of the three basic psychological needs proposed by SDT, that is the needs for autonomy, competence, and relatedness. Findings from this first experiment revealed that social exclusion decreases satisfaction of the three needs, whereas social inclusion increases satisfaction of these needs when compared to the control condition. Furthermore, significant differences were found between the exclusion condition and the inclusion condition for the reported levels of satisfaction of the needs for competence and relatedness. The effects of social exclusion and inclusion on basic needs satisfaction were further investigated in Study 2 (N=70); also, the second study examined how self-determined motivation and behavioural self-regulation are affected. More specifically, it tested whether participants’ persistence at a laboratory task, as well as their intentions for a future peer interaction (intentions to compete against a peer participant and intentions to collaborate with a peer participant) are influenced by social exclusion and inclusion, through the meditating effects of basic needs satisfaction and self-determined motivation. The results suggested that social exclusion, via the effects of basic needs and motivation decreases peer collaboration, whereas social inclusion was shown to have an opposite effect on peer collaboration. The effect of condition via the mediating effects of basic needs satisfaction and motivation failed to predict persistence at the task and peer competition. Lastly, Study 3 (N=624) assessed naturally occurring social exclusion and inclusion in a population of junior high school students. This third study investigated the independent contributions of SDT and NBT in the prediction of academic motivation and high school dropout. Peer relatedness, perceived needs support from parents, and perceived needs support from teachers were examined as potential predictors of academic motivation and high school dropout. Findings suggested that peer relatedness plays an important role in the prediction of academic motivation, but, that perceived needs support from parents and perceived needs support from teachers are stronger predictors of that outcome. Results from this study also revealed that peer relatedness contributes to the prediction of high school dropout, beyond what can be explained by academic motivation, perceived needs support from parents, and perceived needs support from teachers. However, perceived needs support from parents was shown to be the most essential predictor of high school dropout. In sum, findings from this doctoral dissertation suggested that social exclusion has detrimental effects on one’s motivation and behavioural self-regulation. In contrast, social inclusion fosters social support which promotes satisfaction of the basic psychological needs, self-determined motivation, and successful self-regulation. This doctoral thesis contributed to the application of SDT and NBT by comparing elements of the two complementary frameworks. It also offered an original contribution to research on social exclusion and inclusion by examining their impacts on self-determined motivation, and basic needs satisfaction, as well as testing them in both the laboratory setting and the natural setting.

How does the satisfaction (or the lack of satisfaction) of the innate need to have meaningful interpersonal relationships affects behavioural self-regulation? How does having/lacking interpersonal relatedness impact one’s perception of future interpersonal relationships? This doctoral dissertation aimed to answer these two fundamental questions by integrating the views of two complementary theories, need to belong theory (NBT; Baumeister & Leary, 1995) and self-determination theory (SDT; Deci & Ryan, 1985, 2000). Using a series of two laboratory experiments and one longitudinal study, this thesis examined the effects of social exclusion and inclusion on satisfaction of basic psychological needs, self-determined motivation, and self-regulation of behaviours. In Study 1 (N=72), social exclusion and inclusion were manipulated in order to examine their effects on the satisfaction of the three basic psychological needs proposed by SDT, that is the needs for autonomy, competence, and relatedness. Findings from this first experiment revealed that social exclusion decreases satisfaction of the three needs, whereas social inclusion increases satisfaction of these needs when compared to the control condition. Furthermore, significant differences were found between the exclusion condition and the inclusion condition for the reported levels of satisfaction of the needs for competence and relatedness. The effects of social exclusion and inclusion on basic needs satisfaction were further investigated in Study 2 (N=70); also, the second study examined how self-determined motivation and behavioural self-regulation are affected. More specifically, it tested whether participants’ persistence at a laboratory task, as well as their intentions for a future peer interaction (intentions to compete against a peer participant and intentions to collaborate with a peer participant) are influenced by social exclusion and inclusion, through the meditating effects of basic needs satisfaction and self-determined motivation. The results suggested that social exclusion, via the effects of basic needs and motivation decreases peer collaboration, whereas social inclusion was shown to have an opposite effect on peer collaboration. The effect of condition via the mediating effects of basic needs satisfaction and motivation failed to predict persistence at the task and peer competition. Lastly, Study 3 (N=624) assessed naturally occurring social exclusion and inclusion in a population of junior high school students. This third study investigated the independent contributions of SDT and NBT in the prediction of academic motivation and high school dropout. Peer relatedness, perceived needs support from parents, and perceived needs support from teachers were examined as potential predictors of academic motivation and high school dropout. Findings suggested that peer relatedness plays an important role in the prediction of academic motivation, but, that perceived needs support from parents and perceived needs support from teachers are stronger predictors of that outcome. Results from this study also revealed that peer relatedness contributes to the prediction of high school dropout, beyond what can be explained by academic motivation, perceived needs support from parents, and perceived needs support from teachers. However, perceived needs support from parents was shown to be the most essential predictor of high school dropout. In sum, findings from this doctoral dissertation suggested that social exclusion has detrimental effects on one’s motivation and behavioural self-regulation. In contrast, social inclusion fosters social support which promotes satisfaction of the basic psychological needs, self-determined motivation, and successful self-regulation. This doctoral thesis contributed to the application of SDT and NBT by comparing elements of the two complementary frameworks. It also offered an original contribution to research on social exclusion and inclusion by examining their impacts on self-determined motivation, and basic needs satisfaction, as well as testing them in both the laboratory setting and the natural setting.

While the benefits of analysing social networks within the wider humanities are becoming more accepted, very little work of this kind has been done in medieval studies. This thesis seeks to begin to fill this lacuna by considering the advantages of examining historical moments through the lens of ‘network’. Focusing on the later medieval world (in particular c.1300-1520), but also drawing on parallel evidence from the modern day, it demonstrates how the paradigm of ‘network’ allows a more nuanced reading of, predominantly literary, historical moments, which in turn reveals a deeper understanding of collective social thinking and behaviour. This new methodological approach is threefold, drawing on analytic tools from various disciplines. It blends historical contextual investigation with literary analysis, and frames the results in the sociological and anthropological theories of belonging, exchange, and play. The thesis is structured around four case studies, each of which demonstrates a particular form of network formation, and also shows how far these networks reflect their respective cultural milieus and influences. Three medieval chapters focus on what I term ‘literary networks’, a concept ripe for network analysis thanks to the highly participatory nature of medieval literature, and thus theoretically comparable to modern networks based around information exchange. Across the thesis, instances of formal, informal, and virtual networks are considered from medieval France and England, as well as the twenty-first century West. This combination of interdisciplinary method and structure allows innovative new readings of underappreciated sources, whilst also highlighting a transhistorical continuum of universal appeals to social networks: namely, the satisfaction of the human need to belong, the facilitation of competitive play, and the opportunity to acquire social capital and build reputations. This investigative synthesis between medieval material and more modern network evidence reveals that, while realised through unrecognisably altered technologies and experiencing some resultant disruptions, these fundamental appeals of social network membership, in part, remain constant between the two periods.

How does the satisfaction (or the lack of satisfaction) of the innate need to have meaningful interpersonal relationships affects behavioural self-regulation? How does having/lacking interpersonal relatedness impact one’s perception of future interpersonal relationships? This doctoral dissertation aimed to answer these two fundamental questions by integrating the views of two complementary theories, need to belong theory (NBT; Baumeister & Leary, 1995) and self-determination theory (SDT; Deci & Ryan, 1985, 2000). Using a series of two laboratory experiments and one longitudinal study, this thesis examined the effects of social exclusion and inclusion on satisfaction of basic psychological needs, self-determined motivation, and self-regulation of behaviours. In Study 1 (N=72), social exclusion and inclusion were manipulated in order to examine their effects on the satisfaction of the three basic psychological needs proposed by SDT, that is the needs for autonomy, competence, and relatedness. Findings from this first experiment revealed that social exclusion decreases satisfaction of the three needs, whereas social inclusion increases satisfaction of these needs when compared to the control condition. Furthermore, significant differences were found between the exclusion condition and the inclusion condition for the reported levels of satisfaction of the needs for competence and relatedness. The effects of social exclusion and inclusion on basic needs satisfaction were further investigated in Study 2 (N=70); also, the second study examined how self-determined motivation and behavioural self-regulation are affected. More specifically, it tested whether participants’ persistence at a laboratory task, as well as their intentions for a future peer interaction (intentions to compete against a peer participant and intentions to collaborate with a peer participant) are influenced by social exclusion and inclusion, through the meditating effects of basic needs satisfaction and self-determined motivation. The results suggested that social exclusion, via the effects of basic needs and motivation decreases peer collaboration, whereas social inclusion was shown to have an opposite effect on peer collaboration. The effect of condition via the mediating effects of basic needs satisfaction and motivation failed to predict persistence at the task and peer competition. Lastly, Study 3 (N=624) assessed naturally occurring social exclusion and inclusion in a population of junior high school students. This third study investigated the independent contributions of SDT and NBT in the prediction of academic motivation and high school dropout. Peer relatedness, perceived needs support from parents, and perceived needs support from teachers were examined as potential predictors of academic motivation and high school dropout. Findings suggested that peer relatedness plays an important role in the prediction of academic motivation, but, that perceived needs support from parents and perceived needs support from teachers are stronger predictors of that outcome. Results from this study also revealed that peer relatedness contributes to the prediction of high school dropout, beyond what can be explained by academic motivation, perceived needs support from parents, and perceived needs support from teachers. However, perceived needs support from parents was shown to be the most essential predictor of high school dropout. In sum, findings from this doctoral dissertation suggested that social exclusion has detrimental effects on one’s motivation and behavioural self-regulation. In contrast, social inclusion fosters social support which promotes satisfaction of the basic psychological needs, self-determined motivation, and successful self-regulation. This doctoral thesis contributed to the application of SDT and NBT by comparing elements of the two complementary frameworks. It also offered an original contribution to research on social exclusion and inclusion by examining their impacts on self-determined motivation, and basic needs satisfaction, as well as testing them in both the laboratory setting and the natural setting.