THE ROLES OF INTRUSIVE VISUAL IMAGERY AND VISUAL IMAGERY ABILITY IN INSOMNIA DISORDER

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Tez Doktora Kutlu Kağan Türkarslan.pdf

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2022-8-19

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Türkarslan, Kutlu Kağan

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A number of theoretical models have been proposed to understand and explain insomnia disorder and its etiology. The present thesis argued that intrusive visual imagery (IVI) in the pre-sleep period may lead to classical conditioning which evokes and perpetuates hyperarousal in chronic insomnia. In Study 1 (N = 651), Pre-sleep Arousal Scale (PSAS) and Intrusive Visual Imagery and Verbal Thoughts Questionnaires (IVIVTQ) were adapted to Turkish. Factor structures of the Turkish forms were tested with exploratory factor analysis and confirmatory factor analysis in split half samples. The validities (convergent, divergent, incremental, discriminant) and reliabilities (internal consistency and test-retest) of the Turkish forms were also assessed in a subsample (N = 556) and a separate third sample (N = 88). The results of Study 1 showed that the Turkish forms of PSAS and IVIVTQ had good validity and reliability features. In Study 2, a path model comprising the variables of intrusive visual imagery (IVI), intrusive verbal thoughts (IVT), visual imagery ability (VIA), pre-sleep arousal (PSA), and insomnia severity (IS) was tested with 168 of 1444 participants who met DSM-5 criteria for Insomnia Disorder. The results showed that IVI, but not IVT, significantly predicted PSA and PSA predicted IS. Furthermore, the indirect effects of IVI via PSA on IS was significant. Finally, the moderator role of VIA on the relationship between IVI and PSA was not significant. The results of the studies were discussed in the light of existing literature. Clinical implications and suggestions for the future studies were proposed.

Subject Keywords

Insomnia, Intrusive Thoughts, Visual Imagery, Sleep, Fear

URI

https://hdl.handle.net/11511/98566

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Graduate School of Social Sciences, Thesis

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Citation Formats

K. K. Türkarslan, “THE ROLES OF INTRUSIVE VISUAL IMAGERY AND VISUAL IMAGERY ABILITY IN INSOMNIA DISORDER,” Ph.D. - Doctoral Program, Middle East Technical University, 2022.