Illusory Truth Effect
Version 1.0.0 · Updated 2026-07-31
CORE DEFINITION
Repetition makes people more likely to believe something is true. Even an obvious lie, if repeated enough times, can be misjudged as truth because the brain's processing fluency for that information increases (it sounds smooth and familiar). This is the cognitive mechanism behind brainwashing. It differs from the mere exposure effect (which generates liking); here the focus is on generating credibility. This is also why fake news and rumors spread. The way to counter it is to be highly vigilant about claims that sound familiar but lack evidence, because familiarity often masquerades as truth.
SCAFFOLDING EFFECT
Reduce cognitive load
The cognitive mechanism of brainwashing. It differs from the mere exposure effect (which generates liking); here the focus is on generating credibility. This is also why fake news and rumors spread. The way to counter it is to be highly vigilant about claims that sound familiar but lack evidence, because familiarity often masquerades as truth.
Anchor fast decisions
Repeated exposure increases the processing fluency of information—familiar content is processed faster and with less effort by the brain. The brain mistakes this 'smoothness' for a heuristic cue of 'truth', i.e., 'what is easy to think of is true'. Thus, familiarity replaces evidence as a cheap proxy for truth.
MINIMUM ACTION
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Illusory_truth_effectverified
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