Law 17 — Repeat It Until It Feels True

Repeat it until it feels true.

Hasher, Goldstein and Toppino's 1977 study is chapter 25 and chapter 67. Statements rated for truth across three sessions two weeks apart were rated more true when repeated, regardless of whether they were true.

Fazio and colleagues' 2015 paper is the operational payload, and its title is the finding: knowledge does not protect against illusory truth. Participants who could correctly answer a factual question when asked directly still rated a repeated contradictory statement as more true. Stored knowledge and processing fluency compete at the moment of judgment, and fluency does not lose as often as it should.

The mechanism is source monitoring failure. The mind registers that a claim is easy to process, must attribute that ease to something, and the accessible attribution — this is consistent with what I know — outcompetes the correct one, which is I have encountered this before.

The operational implications are three, and they are the reason repetition is the dominant technique in political communication.

Volume substitutes for argument. A claim does not need to be defended; it needs to be present. This is why talking points are distributed verbatim to dozens of speakers — the objective is not to persuade any one listener but to accumulate exposures across a population.

Apparent independence multiplies the effect, because encountering a claim from what seem to be several sources simulates consensus. Chapters 192, 227 and 231 all describe manufactured versions of this.

And correction is expensive and partially counterproductive, because repeating the false claim in order to debunk it adds an exposure. Lewandowsky and colleagues' continued influence effect shows that retracted misinformation continues to shape inference after people accept the retraction.

The boundary is where repetition is used to install a falsehood rather than to make a true claim memorable. A campaign that repeats a slogan is using the same mechanism as a campaign that repeats a fabrication, and the mechanism is indifferent — which is the operator's temptation and the reason chapter 210 exists.

The counter is source-counting: before treating a claim as established, ask how many independent origins it actually has, as against how many times you have encountered it.