Electronic Theses and Dissertations

Identifier

755

Date

2012

Date of Award

11-30-2012

Document Type

Dissertation

Degree Name

Doctor of Philosophy

Major

English

Concentration

Applied Linguistics

Committee Chair

Philip M McCarthy

Committee Member

Emily Thrush

Committee Member

Reginald Martin

Committee Member

Rick Dale

Abstract

Political discourse is an observable, measurable, and testable manifestation of political worldviews. However, when worldviews collide, notions of truth and of lies are put to the test. The challenge for researchers is how to establish confidence in their analysis. Despite the growing interest in deception research from a diversity of fields and industries, the trend is to focus on validating the assessment approach to the data without considering validity issues related to the data itself. Such a trend is concerned more with how to assess linguistic features and less with what is being assessed. By contrast, this dissertation is concerned with both the how and what of deception analysis. Of necessity, establishing validity of the data needs to be addressed first. To this end, I use the computational textual analysis tool of the Gramulator to facilitate validating a corpus of truthful texts and deceptive texts written by self-described liberals and conservatives. Specifically, I apply the internal validity process (IVP) to the corpus. The IVP comprises rigorous validity assessments of the homogeneity and the markedness of the data as well as the derived indices. This process aims to validate what is being assessed (i.e., truthful texts and deceptive texts). I then use the Gramulator to analyze the corpus. Specifically, I conduct a linguistic style matching analysis and a distal language analysis of the corpus. The linguistic style matching analysis assesses the degree to which deceivers and truth tellers from divergent political groups coordinate their language. By contrast, the distal language analysis assesses the degree to which those same groups differ in their pronoun and pronominal usage. These analyses reveal how computational approaches in combination with linguistic theory facilitate deception analysis. The results of my dissertation suggest that the IVP supplies compelling evidence for the validity of the corpus. These results also suggest that linguistic style matching and distal language usage may be deception strategies used to influence others into a false belief. Taken as a whole, my dissertation offers greater insight into how subtle differences in the framing of word choices facilitate the identification of prominent features of deception in political discourse.

Comments

Data is provided by the student.

Library Comment

dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.

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