The Influence of Repetitive Health Messages and Sensitivity to Fluency on the Truth Effect in Advertising

Although merely repeating a product claim does not influence the objective validity of the claim, it often increases the subjective validity of the claim (the truth effect). Research notes that the truth effect plays an important role in health advertising. The present research investigates the moderating role of sensitivity to feelings of fluency (or processing ease) on the truth effect. The truth effect was more pronounced when the need for affect was high rather than low (Study 1) and when consumers were primed to trust their feelings (Study 2). Finally, Study 3 and Study 4 replicate these findings using advertising appeals. Advertisements that encourage consumers to focus on their feelings increase susceptibility to the truth effect.