Somewhere in your company, there is a fact that isn't one. Maybe it's "our users don't read email." Maybe it's "the last redesign hurt retention," or "legal will never approve that." Nobody remembers where it came from. Nobody has seen the underlying data. But it has been said in enough meetings, by enough people, in enough confident tones, that questioning it now would feel vaguely rude — like asking a family to produce documentation for a beloved story about a great-uncle. The claim has stopped being an idea. It has become part of the furniture.

This is not a failure of intelligence, and it is not laziness. It is a well-documented quirk of human memory called the illusory truth effect: the finding that simply hearing a statement repeated makes it feel more true, regardless of whether it is. And a recurring meeting is the most efficient machine your organization owns for producing it.

Repetition feels like evidence

The effect was first demonstrated in 1977, when psychologists Lynn Hasher, David Goldstein, and Thomas Toppino asked students to rate the truth of plausible-sounding trivia statements across several sessions spaced weeks apart. Some statements appeared only once; others were quietly repeated. The repeated statements were rated as more true — and it didn't matter whether they actually were. Mere re-exposure moved the needle.

The finding has been replicated many times since, across ages, topics, and formats. It is one of the more robust results in cognitive psychology, and its implication is genuinely unsettling: your sense of what's true is not purely a record of evidence. It is partly a record of exposure.

The fluency shortcut

The mechanism behind it is called processing fluency. The second or third time your brain processes a statement, it handles it faster and more smoothly than the first time — the words are familiar, the concepts pre-loaded. And the brain, having no direct gauge for truth, uses that ease as a proxy. This feels smooth. Smooth things are familiar. Familiar things are usually true.

Most of the time, that's a reasonable bet. In ordinary life, true statements really do come around more often than false ones — you hear that fire is hot from a thousand independent sources. The shortcut breaks down only when repetition gets decoupled from accuracy. Which is precisely what happens in advertising, in propaganda, and — less sinisterly but no less effectively — in the Tuesday sync.

Knowing better doesn't protect you

The comforting assumption is that this only works on things you don't know much about. It doesn't hold. In 2015, Lisa Fazio and colleagues published a study bluntly titled "Knowledge does not protect against illusory truth." Participants read statements that contradicted facts they demonstrably knew — the sort of thing almost everyone can answer correctly when asked directly. Repetition still worked. People who knew the right answer nonetheless rated the repeated falsehood as more true than when they saw it fresh.

Fluency, it turns out, doesn't ask permission from your knowledge. It runs underneath it. Which means "we hire smart people" is not a defense. Smart people feel fluency too; they're just more articulate when they repeat things.

Meetings are a repetition machine

Trace the life of a workplace claim. It's born as speculation in a kickoff: "My sense is enterprise customers won't touch this." It gets restated in a status update two weeks later, hedge quietly dropped: "Enterprise customers won't touch this." By the third meeting it's on a slide. By quarterly planning it is a constraint that shapes the roadmap. Nothing new was learned between those meetings. The only thing that changed was the number of exposures.

Two other memory quirks accelerate the process. The first is source amnesia: memory for a claim reliably outlives memory for where the claim came from. You remember that enterprise customers won't touch it; you forget that it was Dave, guessing, before lunch. Stripped of its source, the claim can't be audited — there's nothing left to check.

The second is that meetings repeat by design. The recurring invite, the standing agenda, the deck that gets duplicated and lightly edited each week — every rehash is another exposure, another fluency boost, another small deposit in the claim's account. The illusory truth effect doesn't need anyone to campaign for an idea. The calendar does it automatically.

It also hands quiet power to whoever repeats the most. The colleague who calmly restates the same position across six meetings isn't accumulating evidence. They're accumulating familiarity — and familiarity is routinely mistaken for both consensus and truth. Usually there's no villain in this story. People repeat what they've heard in good faith, and every honest repetition strengthens the claim a little more.

What manufactured facts cost

Decisions inherit their premises. If the premise is folklore, the decision is folklore with a budget attached. Teams kill viable features because "users complained last time," avoid whole markets because "we tried that in 2021," and design processes around constraints no one can trace. The waste is invisible precisely because the premise no longer registers as a claim at all — it registers as background reality, the thing you plan around rather than the thing you examine.

Your next moves

  • Ask "where does that come from?" once per meeting. Pick the one claim everyone is treating as settled and ask for its origin — curious tone, not prosecutorial. Often nobody knows, and watching a room discover that is the whole lesson.
  • Start a claims ledger. Keep a shared doc where any factual claim that drives a decision gets written down with its source and date. A blank source column is your early-warning system.
  • Source statistics on first mention. Make it a team norm that whoever introduces a number names its origin in the same breath ("from the March churn analysis"). It costs five seconds when the claim is fresh and is nearly impossible three meetings later.
  • Don't restate without new evidence. Adopt a personal rule: before repeating your own point in a second meeting, either bring something new or stay quiet. Your repetition should track your evidence, not your conviction.
  • Run a quarterly folklore audit. List the five things your team treats as established fact, then spend thirty minutes trying to trace each one to a source. Expect at least one to evaporate on contact.

The meeting after the meeting

The hard part is that repetition is invisible from inside the conversation. No one in the room is counting how many times a claim has been aired, who first said it, or whether it has picked up evidence or just mileage since. That's exactly the kind of pattern that only shows up when you look back at meetings deliberately — which is what meetingmortem is built for. It helps you run honest postmortems on your meetings, so you can see what was actually said and decided, notice which claims keep resurfacing unexamined, and separate the ideas riding on evidence from the ones riding on familiarity. If some of your team's "facts" have been coasting on repetition, you can start catching them at https://meetingmortem.lumenlabs.works.