Validity judgments of rumors heard multiple times: the shape of the truth effect

Abstract

Research on the illusory truth effect has found that repeated presentation of uncertain statements increases validity judgments of those statements. Three experiments explored the shape of the repetition–validity–judgment relationship over multiple repetitions, the mediating role of processing fluency, and the moderating role of dispositional skepticism. Participants read narratives in which different rumors were repeated 0–6 or 0–9 times; validity estimates, processing fluency, and dispositional skepticism were also measured. Validity judgments were logarithmically related to repetitions; this effect was mediated by processing fluency, and moderated slightly by skepticism. Results explore the boundaries of the processing fluency contrast account of the illusory truth effect, suggest a minor role for skepticism, and inform research on belief in rumor (uncertain statements in circulation).