Psychological certainty has been the subject of a great deal of research across a number of different literatures. This review focuses on prior and ongoing research on attitude certainty-the subjective sense of confidence of conviction a person has about an attitude-to provide a general overview of the role of certainty in attitudes and persuasion.First, we describe the antecedents, or origins, of attitude certainty, with particular attention to the metacognitive appraisals that drive people's feelings of certainty or uncertainty about their own attitudes. Second, we review the known consequences of attitude certainty, emphasizing the role of certainty in shaping information processing, attitude strength, and attitudinal advocacy. Third, we discuss recent developments that point to an upside for uncertainty in persuasion, whereby uncertainty experienced during message processing can increase message engagement and, thus, enhance message impact.Finally, we highlight several promising directions for future research. Our hope is that this review helps organize classic and contemporary research on attitude certainty and, in so doing, sparks new interest and continuing progress in the years to come.
K E Y W O R D Sadvocacy, attitude strength, attitudes, confidence, conviction, information processing, persuasion
| INTRODUCTIONSubjective feelings of certainty and uncertainty play a crucial role in human behavior. Indeed, across diverse literatures, an individual's level of certainty-about a judgment, decision, thought, attitude, or even selfconcept-has been shown to affect how that individual thinks, feels, evaluates, and acts (e.g., Abelson, 1988;Kruglanski, 1989;Petty, Briñol, Tormala, & Wegener, 2007;Tversky & Kahneman, 1974). Within social and consumer psychology, researchers have paid particular attention to the role of certainty in attitudes and persuasion. This interest can be traced back several decades, but in the last 15 years or so a marked growth in this area has occurred (for reviews, see Rucker, Tormala, Petty, & Briñol, 2014;Tormala, 2016). In particular, a wealth of recent research has sought to understand attitude certainty and its origins and consequences.An attitude refers to one's general evaluation of something; the extent to which one sees an object as good or bad, positive or negative.For example, an attitude could reflect the degree to which one likes a product or brand, supports a political candidate, or views a social policy as wise or foolish. Attitude certainty refers to the subjective sense of confidence or conviction one has about an attitude (Gross, Holtz, & Miller, 1995;Rucker et al., 2014;). An individual can be certain or uncertain, confident or doubtful, about the attitude she holds toward a product or brand, a political candidate, a social policy, and so on. In essence, attitude certainty is a metacognitive assessment of an attitude, or a tag on that attitude, that reflects a person's belief that the attitude is correct and/or clear in one's mind (Petrocelli, Tormala, & Rucke...