Thesis (Ph. D.)--University of Queensland, 2002. / Includes bibliographical references.

Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 203-229). Available also in a digital version from Dissertation Abstracts.

Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.

This thesis details the development and testing of a new scale for measuring human attachment to dogs which allows for the measurement of weaker attachment levels as well as stronger ones (the CDA scale). The correlation between dog-owner’s scores on the CDA scale and their dog’s actual attachment behaviour is assessed and discussed, as well as the dog-owners limited ability to predict the behaviour of their dog in a controlled situation (the Strange Situation Test (SST)) whereby the dogs meet a previously unknown person. The CDA scale was formed by utilising items from pre-existing scales (the Comfort from Companion Animals scale and the Lexington Attachment to Pets scale), trialed on the internet with a large self-selected sample of dog-owners and analysed and reduced using factor analysis. The CDA was completed with the addition of some negative items derived from a small sample of dog-owners who expressed drawbacks to keeping a dog. In addition 100 people living with dogs they did not consider themselves to be the primary carer of, and 100 people with dogs they considered to have behavioural problems also completed the CDA to allow for the assessment of reliability and validity, and for consideration of the possible links between human perceptions of attachment/dog behavioural problems and actual scores on the CDA. Dogs’ attachment behaviour was assessed by cluster analysis of behaviours observed in the SSD: 51 dog-owner pairs took part in the study which revealed a number of secure-base behavioural categories analogous to those typically observed in human mother-infant interactions in Ainsworth’s original (1969) SST. In addition five captive wolves were also observed in a modified version of the SST. Data from these observations is discussed in a case-wise manner and it is clear that captive wolves do not exhibit the suite of attachment behaviours (to their familiar handler) as previously observed in the dog study. However, the wolves’ familiar handler was very adept at predicting the behaviour of his wolves in this situation. These findings are important in furthering our understanding of human-canine attachments in general, but especially given the number of dog-owner pairings which appear to fail due to poor or misunderstood attachments. An effective attachment scale for people, and a valid measure and analysis of attachment behaviour in dogs is a further development in ensuring successful pairings of people with dogs in a variety of contexts such as pet dogs and service dogs.

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The purpose of this study was to investigate the links among children's representations of attachment and their intelligence and academic achievement. John Bowlby's attachment theory is the framework used in this study to understand and explain differences in children's intelligence and academic achievement. Bowlby maintained that the quality of children's attachment to their caregivers exerts a strong influence on their ability and interest in investigating their environment. According to attachment theory, the quality of children's attachment to their primary caregivers would be expected to be associated with their intelligence and scholastic achievement. The findings from this study suggest that attachment patterns are significantly related to children's crystallized intelligence, which involves learning, knowledge and skills that are accumulated from past experiences. Attachment patterns were not significantly related to children's global intelligence or their academic achievement. The results of this study are relevant not only to attachment researchers but also school psychologists, parents, and teachers.

The objectives of this research program were to provide evidence of the distinction between global and specific relational models and to assess their relative contributions in the experience of significant life events and daily social interactions. Relationship-specific models were operationalized in two ways: in terms of significant role relationships and in terms of salience (i.e., frequency of interactions). The association between global relational models and specific models, selected on the basis of the other's role (Study 1) or salience (Study 2), was examined. Results indicate that these constructs were correlated, but not redundant. / Moderate stabitily of global and specific models was found over 4 months. Analyses examining the extent to which change in this network of models operated through top-down or bottom-up processes suggested that change occurred mainly as a bottom-up process. Models of self and other for established relationships were generalized to the global models, but the global models did not contribute much to shaping changes in specific models. / Adjustment to two different life events was examined to distinguish between the contributions of global and distinct relationship-specific models in the experience of events eliciting different relational needs. Adjustment to university, anticipated to induce secure base needs, was in part explained by the global model of self and also by the model of other for father. In contrast, adjustment to a romantic breakup, expected to arouse safe haven needs, was associated with the model of self with a close friend, but not parental or global models. / Finally, global and specific models of self and other contributed to explaining the experience of daily interactions within relationships. Relationship-specific models of other were most strongly associated with the quality and intimacy of interactions. The global model of other made modest, but significant additional contributions to explain these ratings. The global model of self moderated the association between specific models of self and ratings of interactions to explain a significant, yet small proportion of the variance. In sum, this research demonstrated that attachment or relational models can be considered both global and specific representational structures, reflecting relational as well as individual differences.

A total of 321 young adult sibling dyads (104 male-female, 108 male-male, and 109 female-female) and 131 singletons completed a set of questionnaires examining the sibling relationship from an attachment perspective. Four central research findings are presented: First, attachment to sibling was significantly correlated with parenting, adult attachment self-model, satisfaction with social support, frequency of contact, and personality traits. Specifically, increased independence encouragement and acceptance by parents, decreased maternal rivalry, a more positive self-model, larger and more satisfying social support networks, and greater frequency of contact between siblings were related to greater quality of attachment to sibling. Also, higher levels of NEO Agreeableness, Conscientiousness, Extraversion, and Emotional Stability were positively correlated with attachment to sibling. Second, there was considerable reciprocity in the attachment relationship for all pair types (r = .58) indicating that siblings' ratings of the quality of their attachment to each other tend to correspond quite highly. Third, more positive self- and other-models were related to increased ratings of positive relationship variables such as affection, emotional support, and satisfaction, and decreased ratings of negative relationship variables such as antagonism, quarreling and alienation. Fourth, concordance rates in attachment self- and other-models were very low, indicating that siblings do not resemble each other in the attachment dimensions. However, siblings appear to describe each other's attachment models relatively accurately, and perceive themselves as having similar self- and other-models to their siblings. Findings are discussed in terms of theoretical advancements for attachment theory and the sibling literature, and practical implications for fostering positive sibling relationships.

Fresh and aged iron particle attachment onto model mineral surfaces was studied using atomic force microscopy based – force spectroscopy (AFM) in different water chemistries as well as in the presence of surface modifiers for the particles (carboxymethyl cellulose polymer). The forces of interactions measured with AFM were explained in terms of classical DLVO forces (electrostatic, Born and van der Waals forces) as well as hydration, steric and magnetic forces, which are not accounted for by classical models. Theoretical interpretation of the results was thus performed using extended models, in which such interactions were considered. In the absence of surface modifiers, iron particle attachment onto silicates and iron oxides appeared favorable in pure water and salt solutions at pH 4 and 5.5, but was hindered in water amended with humic acids. Attachment of bare CIP was also unfavourable at pH 8, except in the presence of CaCl2 salt at 100 mM concentrations. Attachment between iron particles and iron oxides was favorable even in the presence of polymeric coatings. Conversely, in all solutions such coatings contributed to electro-steric repulsion between particles and silicates, which dominated over attractive van der Waals forces, albeit to a lesser extent in the presence of salts. To best assess the role of polymeric coatings in particle attachment, polymer sorption onto the model mineral surfaces considered was investigated using a Quartz Crystal Microbalance with Dissipation Monitoring. The results obtained confirmed the AFM findings, and furnished insights regarding the role of salts on polymer sorption onto substrates. Finally, the effect of aging on attachment was probed both by AFM and by analyzing cementation phenomena of iron aggregates using scanning electron microscopy, as well as by probing changes in particle compositional properties with various spectroscopy tools. The major effect of aging was to promote the formation of large cemented aggregates, which did not appear prone to disruption or remobilization.

Fresh and aged iron particle attachment onto model mineral surfaces was studied using atomic force microscopy based – force spectroscopy (AFM) in different water chemistries as well as in the presence of surface modifiers for the particles (carboxymethyl cellulose polymer). The forces of interactions measured with AFM were explained in terms of classical DLVO forces (electrostatic, Born and van der Waals forces) as well as hydration, steric and magnetic forces, which are not accounted for by classical models. Theoretical interpretation of the results was thus performed using extended models, in which such interactions were considered. In the absence of surface modifiers, iron particle attachment onto silicates and iron oxides appeared favorable in pure water and salt solutions at pH 4 and 5.5, but was hindered in water amended with humic acids. Attachment of bare CIP was also unfavourable at pH 8, except in the presence of CaCl2 salt at 100 mM concentrations. Attachment between iron particles and iron oxides was favorable even in the presence of polymeric coatings. Conversely, in all solutions such coatings contributed to electro-steric repulsion between particles and silicates, which dominated over attractive van der Waals forces, albeit to a lesser extent in the presence of salts. To best assess the role of polymeric coatings in particle attachment, polymer sorption onto the model mineral surfaces considered was investigated using a Quartz Crystal Microbalance with Dissipation Monitoring. The results obtained confirmed the AFM findings, and furnished insights regarding the role of salts on polymer sorption onto substrates. Finally, the effect of aging on attachment was probed both by AFM and by analyzing cementation phenomena of iron aggregates using scanning electron microscopy, as well as by probing changes in particle compositional properties with various spectroscopy tools. The major effect of aging was to promote the formation of large cemented aggregates, which did not appear prone to disruption or remobilization.