Post-stroke fatigue is a common problem that may limit participation in everyday activities. Emerging evidence suggests that group-based training in fatigue management may be an efficient means of reducing the effects of post-stroke fatigue. This mixed methods, quasi-experimental study proposed to determine whether a group-based educational program could be successful in relieving post-stroke fatigue and improving participation in daily activities. A convenience sample of stroke survivors (n=20) from retirement communities in southeastern PA were invited to participate in the research. Participants were screened for depression, motor and cognitive recovery, and sleep quality. Fatigue was measured using the Fatigue Severity Scale (FSS) and activity participation was measured using the Physical Self-Maintenance Scale- Instrumental Activities of Daily Living (PSMS-IADL). The measures were administered in a double pre-test, double post-test format over three seven-week phases; a non-intervention period; a group-based intervention period, and a post-intervention period. Qualitative information was gathered using a self-made Intervention Satisfaction Survey. Data analysis involved measures of central tendency for the demographic information. Tabulations of the survey responses were completed to judge the effectiveness of the group-based program or its’ components from the participants’ perspectives. Results indicated a statistically significant reduction in reported fatigue post-intervention (p= .022), which continued for seven-weeks (p= .240). There was a strong effect size for the post-intervention reduction of fatigue (r= .69). There was a trend toward improved participation in daily activities. Distribution across groups for presence of social support, age, sex, and level of care was found to be equivalent after one-way chi square analysis. There was no significant influence of these variables on fatigue or participation when used as grouping variables in RM-ANOVA. Participants reported feeling most confident scheduling activity to include rest periods and least confident managing sleep problems. Limitations include small sample size, demographics not being representative of the general stroke population, use of self-report measures with possible ceiling effect of PSMS-IADL, instrumentation effect given multiple administrations, and history effects as groups occurred at different time of the year. Overall, the results indicate that participation in a group-based educational program was effective in reducing post-stroke fatigue in chronic stroke.

This study focuses on the interrelationships between risky sexual practices, substance use, and arrest history. The sample consists of 948 newly arrested juvenile offenders processed at a centralized intake facility in 2006. A series of confirmatory factor analysis and structural equation modeling techniques are used to 1) determine if risky sexual behavior, marijuana and cocaine use, and arrest history form a unidimensional latent factor, 2) examine the direct effect of age on the latent factor, and 3) compare the factor structure, as well as the effect of age on the latent factor, across four demographic subgroups based on race and gender. Results provide moderate support for all three research objectives. Important similarities, as well as differences, in the factor structure across the four groups were found. The prevention and intervention implications of the findings, limitations of the current study, and directions for future research are discussed.

Humiliation is a negative, self-conscious emotion that is experienced because of a psychological discrepancy between an individual’s self-concept and how s/he perceives others as viewing him/her. The questions addressed in the present research were whether humiliation can be experienced as a group-based emotion, what are the emotional and behavioural consequences, and what role does ingroup identification play? In line with the intergroup emotion theory (Smith et al., 2007) and related research, three experiments were conducted to address these questions. The results showed that participants reported to feel humiliation on behalf of a humiliated ingroup member. The results further implied that the behavioural responses such as withdrawal and revenge to group-based humiliation depend on the accommodating emotions such as shame and anger. The results addressing the role of ingroup identification were rather ambiguous. The implications of the present research are outlined in detail with regard to the current discourse on intergroup emotions. / Unisa Grow Your Own Timber Programme / Psychology / M.A. (Psychology (Research Consultation))

Public speaking anxiety (PSA), widespread amongst students and also the general population, is associated with substantial distress and interferes with a person’s ability to give a presentation or speech. This can lead to difficulties in social, occupational and academic areas of functioning. Despite its pervasiveness, very few individuals will seek help, most will tend to avoid the anxiety-provoking situations. This can be a serious issue if left untreated, leading to negative impacts on quality of life, for example dropping out of education early and subsequently having limited job opportunities. The literature review explored the existing body of work regarding PSA and presented the rationale for the current research, beginning with a conceptual framework and the manner in which PSA is related to Social Anxiety Disorder (SAD). This was followed by a detailed investigation of existing influential models and treatment modalities for both PSA and SAD. It identified that CBT has been the most effective treatment and has been delivered via different formats; however some individuals with SAD/PSA did not respond to a mainstream CBT approach and continued presenting residual symptoms after therapy. Thus, Acceptance and Commitment Therapy (ACT) was introduced, with an examination of its model and potential to help PSA. Preliminary research employing acceptance-based strategies have provided promising results. The literature review indicated a need for investigation of (i) more readily disseminated, briefer formats of ACT and (ii) whether differences exist in efficacy and sustainability between non-guided self-help and group-led therapies format. Given the large number of individuals experience PSA/SAD and the limited availability of resources, there is a need to consider ways of improving access. Thus, development of ultra-brief interventions would potentially reduce delivery cost and enhance dissemination to a larger population. Keywords: public speaking anxiety, social anxiety, interventions, experiential avoidance, fear of negative evaluation, acceptance.

How do people maintain a sense of control when they realize the noncontingencies in their personal life and their strong interdependence with other people? Why do individuals continue to act on overwhelming collective problems, such as climate change, that are clearly beyond their personal control? Group-based control theory proposes that it is social identification with agentic groups and engagement in collective action that serve to maintain and restore people’s sense of control, especially when their personal control is threatened. As a consequence, group-based control may enable people to act adaptively and stay healthy even when personal control seems futile. These claims are supported by evidence showing increased in-group identification and group-based action intentions following reminders of low personal control. Furthermore, these responses of identifying with agentic in-groups increase people’s perceived control and well-being. This article succinctly presents group-based control theory and relevant empirical findings. It also elaborates on how group-based control relates to other social-identity motives and how it may explain social phenomena.

<p>This dissertation examined several dimensions of the development of physical aggression and indirect aggression in a longitudinal sample of boys and girls. These data are part of the National Longitudinal Study of Children and Youth which evaluated the development of children bi-annually from 1994 to 2010. The data for this thesis come from individuals aged 10 and 11 in Cycle 1 (1994) through to Cycle 5 (2002) when they were 18 and 19. In an attempt to explore trends in the development of aggression, the research is presented as three separate projects that examine the following: (1) measurement of physical and indirect aggression by informant and sex; (2) group-based trajectories of physical and indirect aggression and outcomes of trajectories in emerging adulthood; and (3) association between indirect aggression in adolescence and depression in emerging adulthood when physical aggression is taken into account. This is the first longitudinal study to investigate group-based physical and indirect aggression trajectories in childhood and adolescence and outcomes in emerging adulthood. The contribution of this thesis to the field of epidemiological research on aggression is the importance of considering distinct subgroups within both physical and indirect aggression, and joint trajectory groups of both physical and indirect aggression when exploring developmental trends and outcomes of aggression.</p> / Doctor of Philosophy (PhD)

With the advent of quantum computers, the security of number-theoretic cryptography has been compromised. Consequently, new cryptosystems have been suggested in the field of non-commutative group theory. In this thesis, we provide all the necessary background to understand and work with the Artin groups. We then show that Artin groups of finite type and Artin groups of large type possess an easily-computable normal form by explicitly writing the algorithms. This solution to the word problem makes these groups candidates to be cryptographic platforms. Finally, we present some combinatorial problems that can be used in group-based cryptography and we conjecture, through empirical evidence, that the conjugacy problem in Artin groups of large type is not a hard problem.

No description available.

With the advent of quantum computers, the security of number-theoretic cryptography has been compromised. Consequently, new cryptosystems have been suggested in the field of non-commutative group theory. In this thesis, we provide all the necessary background to understand and work with the Artin groups. We then show that Artin groups of finite type and Artin groups of large type possess an easily-computable normal form by explicitly writing the algorithms. This solution to the word problem makes these groups candidates to be cryptographic platforms. Finally, we present some combinatorial problems that can be used in group-based cryptography and we conjecture, through empirical evidence, that the conjugacy problem in Artin groups of large type is not a hard problem.

Background: Childhood excess weight and family food insecurity are food-system related public health problems that exist in Canada. Since both relate to issues of food accessibility and availability, which have elements of “place”, they may share common risk factors in the local environment that are amenable to intervention. In this area of research, the literature derives mostly from a US context, and there is a dearth of high quality evidence, specifically from longitudinal studies. Objectives: The main objectives of this thesis were to examine the adjusted associations between the place factors: material deprivation, social deprivation, social cohesion, disorder, and living location, with change in child BMI Z-score and with change in family food insecurity status in a Canadian cohort of children. Methods: The Québec Longitudinal Study of Child Development was used to meet the main objectives of this thesis. Response data from six collection cycles (4 – 10 years of age) were used in three main analyses. The first analysis examined change in child BMI Z-score as a function of the place factors using mixed models regression. The second analysis examined change in child BMI Z-score as a function of place factors using group-based trajectory modeling. The third and final analysis examined change in family food insecurity status as a function of the place factors using generalized estimating equations. Results: Social deprivation, social cohesion and disorder were strongly and positively associated with family food insecurity, increasing the odds by 45-76%. These place factors, on the other hand, were not consistently associated with child weight status. Material deprivation was not important for either outcome, except for a slight positive association in the mixed models analysis of child weight status. Living location was not important in explaining family food insecurity. On the other hand, it was associated with child weight status in both analyses, but the nature of the relationship is still unclear. Conclusions: Results do not suggest that addressing similar place factors may alleviate both child excess weight and family food insecurity. More high quality longitudinal and experimental studies are needed to clarify relationships between the local environment and child weight status and family food insecurity.