Here's a counterintuitive finding from 208 psychology experiments: people who are exposed to something without even noticing it develop a STRONGER preference than people who see it consciously.
This is the mere exposure effect, and it's one of the most replicated findings in all of psychology.
The Numbers
Robert Bornstein's 1989 meta-analysis of 208 experiments (Psychological Bulletin) established the overall effect size at r = 0.26 — a moderate, reliable effect. Simply encountering something repeatedly makes you like it more.
But here's the twist: when exposure happens below conscious awareness — seeing something without registering that you saw it — the effect nearly doubles to r = 0.528.
Why? Because conscious exposure activates your critical filter. "That's an ad. That's marketing. I'm being sold to." Peripheral exposure bypasses the filter entirely and goes straight to building familiarity.
What This Means for Your Content
Montoya et al. (2017) conducted the largest modern meta-analysis — 268 curve estimates from 81 studies published in Psychological Bulletin. They found that the mere exposure effect follows an inverted-U curve:
Exposures 1-10: Liking steadily increases
Exposures 10-36: Sweet spot — peak familiarity and preference
Beyond 36: Diminishing returns (overexposure fatigue)
The peak effect occurs around 36 exposures. For a business creating educational content, this means:
- A 5-7 email sequence = 5-7 touchpoints
- A free mini-course with 3-5 lessons = 3-5 more
- Blog posts they scroll past = peripheral exposures
- Your brand in their inbox (even unread) = exposure
That's 15-25+ natural exposures during a typical buyer journey — right in the optimal zone.
Why Consistent Educational Content Beats Brilliant Ads
The mechanism behind all this is processing fluency (Reber, Winkielman & Schwarz, 1998). Here's the chain:
1. Repeated exposure makes things easier to process
2. Easier processing feels good
3. Feeling good gets attributed to the brand — "I like this"
4. Like leads to trust leads to purchase
Research by Zurn & Topolinski (2017) showed that processing fluency directly influences trust — across 5 experiments, people invested more resources in partners whose names were easier to process.
Now combine this with content marketing data:
81% of consumers need to trust a brand before buying
58% trust brands more when content is educational vs promotional
B2B buyers consume 3-7+ pieces of content before even contacting sales
90% of consumers say authenticity matters in brand choice
Educational content wins twice: it builds trust through competence demonstration AND through mere exposure. Each piece of content is both value delivery and a trust-building touchpoint.
The "Nobody Reads My Emails" Objection — Dissolved
This is the finding that should change how you think about email marketing entirely:
They don't need to read your emails for them to work.
Bornstein's subliminal exposure data (r = 0.528 vs r = 0.26) proves that peripheral exposure — seeing the subject line, noticing your brand name in the inbox, scrolling past without opening — builds MORE preference than conscious engagement.
Every email you send that goes unopened still counts. Every blog post they scroll past still registers. Every time they see your course thumbnail in their account — exposure.
Stop measuring success only by open rates. Start measuring by consistency.
The Practical Formula
Based on this research, here's what builds maximum trust:
1. Show up consistently — 10-36 exposures over weeks, not 3 brilliant pieces and silence
2. Keep it simple — Processing fluency means easy-to-read, clean, predictable formatting builds trust faster than clever design
3. Educational over promotional — 58% trust boost for teaching over selling
4. Don't obsess over individual pieces — No single email or blog post creates the trust. The accumulation does.
5. Automate the touchpoints — An email sequence, a free course, and a content library create ongoing exposure without ongoing effort
The solopreneur who publishes a mediocre FAQ video every week builds more trust than the perfectionist who publishes one stunning video per quarter.
Consistency over brilliance. Exposure over excellence. Showing up over showing off.
Sources
Bornstein, R. F. (1989). Exposure and affect: Overview and meta-analysis of research, 1968-1987. Psychological Bulletin, 106(2), 265-289. (208 experiments)
Montoya, R. M., Horton, R. S., Vevea, J. L., Citkowicz, M., & Lauber, E. A. (2017). A re-examination of the mere exposure effect. Psychological Bulletin, 143, 459-498. (268 estimates, 81 articles)
Reber, R., Winkielman, P., & Schwarz, N. (1998). Effects of perceptual fluency on affective judgments. Psychological Science, 9(1), 45-48.
Zurn, M. & Topolinski, S. (2017). Processing fluency and trust in economic games. 5 experiments.
Edelman Trust Barometer (2025). Brand trust and familiarity findings.
Lee, A. Y. & Labroo, A. A. (2004). The effect of conceptual and perceptual fluency on brand evaluation. Journal of Marketing Research, 41(2), 151-165.