Have you ever felt that something "sounds right" without remembering where you heard it? That feeling has a name. Psychologists call it the illusory truth effect: repeated statements are judged as more likely to be true than new ones, regardless of whether they are.
The original finding
In 1977, Lynn Hasher, David Goldstein and Thomas Toppino asked participants to rate how true various statements were over several sessions. Some statements appeared more than once. Repeated statements were rated as more true, whether they were actually true or false. Familiarity was being mistaken for accuracy.
Knowing better is not enough
It would be comforting to think that knowledge protects us. Research published in 2015 by Lisa Fazio and colleagues suggests it often does not. Even when participants knew the correct answer, repetition of a false statement still increased how true it felt. Fluency, the ease with which the brain processes something familiar, acts as a shortcut for truth.
Why this matters for misinformation
- Repetition is a strategy. Claims repeated across many accounts gain a sense of credibility that no single source could give them.
- Debunking can backfire in form. A correction that repeats the myth prominently, especially in the headline, can spread the myth further.
- Volume beats quality. A falsehood seen ten times can feel truer than a fact seen once.
How to correct without amplifying
Communication researchers recommend a "truth sandwich":
- Start with the fact.
- Mention the false claim briefly, clearly labelled as false.
- Explain why it is wrong, and repeat the fact.
Lead with what is true, not with the myth you want to dislodge.
What you can do as a reader
When a claim feels familiar, ask where you first encountered it, and whether you ever saw evidence or only repetition. Familiarity is a reason to check, not a reason to trust.
How Honest Lens is designed around this
A report from Honest Lens leads with the claim and its evidence status, then explains why, then shows the sources. It separates each claim so that a true detail cannot lend its credibility to a false one next to it. Permanent share links let a correction travel as easily as the original claim.
Sources: Hasher, L., Goldstein, D., & Toppino, T. (1977). Frequency and the conference of referential validity. Journal of Verbal Learning and Verbal Behavior, 16(1), 107–112. Fazio, L. K., Brashier, N. M., Payne, B. K., & Marsh, E. J. (2015). Knowledge does not protect against illusory truth. Journal of Experimental Psychology: General, 144(5), 993–1002.