Case file
Illusory Truth Effect
- Filed under
- Too Much Information
- Also recorded as
- Illusion of truth effect
The charge
Repeated statements start to feel true simply because they feel familiar. Familiarity gets misread as accuracy.
How it operates
Repeated exposure increases processing fluency, and the brain treats easy-to-process claims as more believable. This happens even when the repetition comes without new evidence.
Logged incidents
- Incident 01
A roadmap myth becomes accepted inside a company because the same slide deck has been reused for months.
- Incident 02
Customers begin to believe a weak marketing claim because they have seen it in ads, onboarding copy, and sales calls.
- Incident 03
An executive keeps repeating that enterprise users do not self-serve, and the team starts treating it as fact without checking funnel data.
What to watch for
Ask yourself: 'Does this claim feel true because I have verified it, or because I have heard it many times?'
Recommended action
Use accuracy prompts and source verification before repeating or acting on a claim. A truth sandwich and prebunking can also reduce the effect in misinformation settings.
Known associates
- Availability HeuristicWe judge how likely or common something is by how easily examples come to mind, not by actual frequency.
- Attentional BiasWe selectively notice certain kinds of information while overlooking the rest, especially information tied to…
- Mere-Exposure EffectWe tend to like things more after repeated exposure, even when the repetition provides no new value.
- Context EffectOur judgment of an option shifts depending on what other options or surrounding cues are present.
- Cue-Dependent ForgettingInformation can be stored but hard to retrieve when the cues present at recall do not match the cues present…
- Mood-Congruent Memory BiasWhen we are in a given mood, memories that match that mood come to mind more easily.
Source of record