Dissertation (Ph.D.)--University of Toledo, 2007. / Typescript. "Submitted as partial fulfillment of the requirements for the Doctor of Philosophy degree in Psychology." Bibliography: 76-83.

Thesis (MA(Clinical Psychology)--University of Pretoria, 2002. / Includes bibliographical references.

Trichotillomania (TTM) is currently classified as an impulse disorder in the DSM-IV, but there is a growing consensus amongst researchers that trichotillomania should be placed on the putative QCD-related disorders spectrum. QCD and TTM have been compared in many fields including neurobiology, phenomenology and epidemiology. Studies of cognition in QCD and TTM typically focus on automatic thoughts and underlying assumptions and there is a paucity of research into enduring cognitive structures, or schemas, associated with the two disorders. This thesis reviews the available evidence regarding the relationship between QCD and TTM. The Young Schema Questionnaire (YSQ) was used to measure 15 maladaptive schemas in 96 QCD patients, 34 TTM patients, and 94 controls. In the comparison between QCD and TTM it was found that depression has a major impact on the profile of schemas in QCD. When controlling for depression a few differences in schema profile were found between QCD and TTM, though the schema enmeshment emerged as significant in both disorders. These findings are discussed in the light of the debate around the classification of trichotillomania in the psychiatric nomenclature. / Thesis (M.A.)-University of Natal, Pietermaritzburg, 2003.

Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisor: Robert F. Simons, Dept. of Psychology. Includes bibliographical references.

The emotions associated with initiating, maintaining, and reinforcing hairpulling disorder (trichotillomania) were studied. Studies conducted have only looked at small community or inpatient samples, and little is known about the interplay of hairpulling subtypes and emotions. For this study, 427 participants completed an online questionnaire around their hairpulling subtype, severity, emotions experienced by hairpulling, and comorbid anxiety and depression. Using the Milwaukee Inventory for Subtypes of Trichotillomania-Adult Version (MIST-A; Flessner, Woods, Franklin, Cashin, & Keuthen, 2008), this is the first study to address the regulation of emotions across subtypes. Participants were divided as either high- or low-focused and either high- or low automatic. Significant differences between hairpulling subtypes and hairpulling severity were reported. Subtypes differed in the severity they experienced emotions; individuals with high-focused pulling reported more intense negative emotions, and a greater number of emotions regulated by pulling. Positive emotions⎯happiness, relief, and calm⎯were also found to play a significant role in reinforcing hairpulling. For high-focused subtypes, negative emotions before- and after-pulling were associated with greater severity, indicating that altering negative emotions via pulling plays an important role for high-focused subtypes. High-focused subtypes also reported higher stress, depression and anxiety than either automatic subtypes or the general population, and were found to have anxiety and depression significantly associated with hairpulling severity and experiencing negative emotions that initiated hairpulling. Clinical and treatment implications, study limitations, and areas of future research are discussed / xviii, 227 leaves ; 29 cm