Recently there has been a resurgence of interest in the influence of ideology on the formation and maintenance of political attitudes. Much of this work has examined ideology as an individual difference that influences evaluations of political issues; these studies instead examined how one's ideology explicitly serves to polarize political opinions. Using the self-validation perspective as a theoretical backdrop, two studies examine the role of political ideology in validating thoughts about a political issue. In Study 1, considering one's political ideology after writing about one's attitude toward abortion increased thought confidence and attitude extremity related to abortion. Study 2 utilized a more subtle manipulation of ideology salience and found that political ideology validated thoughts about abortion, but not the issue of changing the legal drinking age (an issue less related to political ideology). These studies suggest that political ideology plays a role in attitude extremity and certainty toward ideology-relevant issues.

Three studies examined how the perception that one’s attitudes are based in values affects attitude clarity and correctness. Specifically, perceiving that one’s attitude is based in important values increases attitude clarity (the subjective sense that one knows one’s attitude) but not attitude correctness (the subjective sense that the attitude is correct). To test this, participants read a counterattitudinal message and were given feedback about the basis of their attitude. Relative to participants who learned that their attitudes were weakly based in values, participants who were told that their attitudes were strongly based in values reported greater attitude clarity than correctness (Study 1). Similarly, increases in attitude clarity from having an attitude based in values increased the perception that participants effortfully processed the message (Studies 2 and 3), the belief that participants more successfully resisted the message, and participants’ intentions to act on the attitude.

The student author and the program of study committee are solely responsible for the content of this thesis. The Graduate College will ensure this thesis is globally accessible and will not permit alterations after a degree is conferred.

The present research examines whether the perceived uniqueness of one’s thoughts and salience of uniqueness motivations can influence attitude strength and resistance. Participants who rated their thoughts as relatively unique formed attitudes that showed greater correspondence with behavioral intentions to act on the attitude (Study 1). In Study 2, participants who recalled a previous purchase motivated by the desire to be unique (versus to fit in) after generating message counterarguments were less persuaded (more resistant) and reported greater willingness to act on their (negative) attitude. Moreover, attitudes mediated the effect of the purchase manipulation on intentions to act on the attitude.

The student author, whose presentation of the scholarship herein was approved by the program of study committee, is solely responsible for the content of this dissertation. The Graduate College will ensure this dissertation is globally accessible and will not permit alterations after a degree is conferred.