ABSTRACT
The illusory truth effect is the effect that repetition increases the perceived truth of information. The chapter outlines the relevance of the effect in the real world (e.g., with regard to repeated misinformation and repeated advertisements) before it takes a closer look at how the effect is studied experimentally. It then turns to the question of why the effect occurs and whether the effect varies depending on certain features of the presented statements, context characteristics, and interindividual differences. In light of new findings suggesting that the illusory truth effect may be even stronger under naturalistic conditions than under controlled laboratory conditions, the chapter finally gives an overview over different debiasing studies that have attempted to eliminate or at least reduce the truth effect.
