Melbourne School of Psychological Sciences - Theses
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ItemThe relationship between anxiety vulnerability and stress in the cognitive processing of threat-related information( 2000-03)In order to clarify the relationship between anxiety vulnerability and clinical anxiety, information-processing models have been employed to examine the cognitive biases of anxious individuals for threat-related information. At the core of these models are research findings indicating that anxiety-linked attentional biases render high trait anxious individuals disproportionately vulnerable to the effects of stress. The current research, following the model of Williams, Watts, MacLeod, and Matthews (1988), tested the hypothesis that attention to threat-related information is due to the interaction of trait anxiety and state anxiety. Five comparable studies employed emotional Stroop and probe-detection paradigms to assess the attentional biases of high and low trait anxious individuals to threat-related words in response to elevations of stress. Four of the studies assessed the preconscious and conscious attentional biases of adults and one study investigated the attentional biases of children. This focus allowed developmental comparisons that had not been undertaken previously. The studies were comparable to each other and to previous research. The studies sought to clarify the effects of different forms of stress on the anxiety-linked attentional biases and to assess the effects of these stressors on domain-specific stimuli. The hypotheses were that, in response to elevations in state anxiety, high trait anxious individuals show increased attention to threat and low trait anxious individuals show avoidance of threat. It was expected that these threat-related attentional biases are identified at both preconscious and conscious levels of processing, and more when the stimuli are related to the individuals’ domain of concern. Contrary to expectations, only one study found the predicted pattern and this result occurred at a conscious level of processing. In addition to the lack of support for the hypotheses, a counter-intuitive alternative pattern that was the converse of predictions was identified in four of the five studies. In this pattern, in response to elevated stress, there was a trend for high trait anxious individuals to show decreased attention to threat and low trait anxious individuals to show increased attention to threat. The pattern was identified, in various studies, at conscious and preconscious levels of processing, and more in response to domain-specific stimuli. Adults and children showed similar levels and types of attentional biases. The results of the current studies show some convergence with previous research. The findings are discussed in the context of a proposed model that incorporated aspects of Williams et al’s theories (1988; Williams, Watts, MacLeod, & Mathews, 1977) and Mogg and Bradley’s (1988) theory. This model suggests that high and low trait anxious individuals’ patterns of threat-related attentional biases vary according to their different levels of reactivity to stress, which affects their threat threshold. Due to differences in this threat threshold, high and low trait anxious individuals show divergent attentional responses under the same level of external stress. The model incorporates the avoidance effects identified in previous research and theory. This model may explain both the current counter-intuitive findings and past inconsistencies in the literature. It may also clarify how individuals with different levels of anxiety vulnerability show divergent attentional responses to stress elevations. It is suggested that inclusion of the notion of subjective stimulus threat value into the cognitive processing paradigm may clarify some of the unresolved issues raised in this research.