![]() Both negative beliefs about worry and intolerance of uncertainty were significant predictors of change in GAD-type symptoms, but analyses indicated that their contributions were not independent of each other. In the fifth study, changes in GAD-type symptoms over time were assessed using a longitudinal design. Results were generally as predicted, although were tempered by the difficulties inherent in inducing GAD-type symptoms in an experimental context. In the third and fourth studies the central variables of the intolerance of uncertainty model (intolerance of uncertainty) and the metacognitive model (beliefs about the negative consequences of worrying) were experimentally manipulated and their effect on GAD-type symptoms observed. cognitive avoidance, positive beliefs about worry, and behaviour) were also identified. ![]() Limitations concerning the peripheral variables of the models (ie. Analyses revealed that the central variables of each model (negative beliefs about worry and intolerance of uncertainty) were good predictors of GAD-type symptoms. The first two studies investigated the extent to which the variables of each of these models were associated with GAD-type symptoms at a single point in time. ![]() The aims of this thesis were to explore the development of GAD and GAD-type symptoms and to examine the degree to which these models provide accurate accounts of the development of GAD. ![]() The mechanisms by which non-pathological worry escalates into the pathological worry characteristic of GAD are described by two influential models: the metacognitive model and the intolerance of uncertainty model. Excessive and uncontrollable worry is a cardinal feature of Generalised Anxiety Disorder. ![]()
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