Illusory Truth Effect
Repeated statements are more likely to be believed as true, increasing the source's credibility and influence.
Why it works
Based on Hasher et al. (1977) research, repeated exposure increases perceived truthfulness through processing fluency. The brain mistakes familiarity for accuracy, as repeated statements become easier to process and feel more correct. This occurs even when people know the source is unreliable, making it a powerful but potentially dangerous cognitive bias (Begg et al., 1992).
Application examples
Email Campaigns
Consistently ranked #1 in customer satisfaction - year after year
Still the most trusted name in security - just like we've been for 15 years
Product Pages
The reliable choice - trusted by millions since 2010
Award-winning quality • Industry leader • Customer favorite
Landing Pages
The productivity tool that actually works - proven by 2M+ users daily
Security you can trust - protecting businesses since 2005
Social Media Ads
Still the #1 choice for professionals - see why millions agree
The sustainable choice - better for you, better for the planet
Push Notifications
Your trusted productivity partner is here to help again today
Implementation tips
- Use consistent key messages across all touchpoints and campaigns
- A/B test message repetition frequency - too much can cause irritation
- Ensure repeated claims are absolutely truthful and verifiable
- Vary the phrasing while keeping core messages consistent
- Track brand recall and association metrics to measure effectiveness
- Use repetition strategically for most important brand attributes only
eCommerce fit
Not recommended High risk of misuse for spreading false claims. While repetition can build legitimate brand recognition, this principle's potential for manipulation outweighs benefits in ethical e-commerce applications.
Caution
CRITICAL: Never use this principle to repeat false or misleading claims - the ethical obligation to truthfulness is absolute. Repeated falsehoods can create legal liability and permanent reputation damage. Use only with verified, accurate statements. Monitor for overexposure that creates negative reactions.
Best for products
- established-brands
- trust-dependent-services
- competitive-markets
- brand-building-campaigns
Keywords
- consistently
- always
- trusted
- proven
- reliable
- established