I’m going to go out on a limb here and assume you’ve seen yard signs with phrases that have stuck in your head well after you saw them. The thing is, you didn’t set out to remember the slogans, but you drove past the sign a few times on the way to the store or work, and now it lives in your head. Nothing’s wrong with your memory. That’s how repetition works, and anyone who writes slogans for a living knows exactly what they’re doing.

Why hearing a slogan again makes it feel true

Let’s go back to 1977, when three researchers showed people a list of statements, some true and some false, on three different occasions over several weeks. The statements people had seen before were rated as more true each time they read them, even though nothing new had been added. They were simply familiar.

Psychologists call this the illusory truth effect. A 2010 review of 51 studies found the same pattern across the research. And a 2015 study from Duke found that repetition raised how true a statement felt even when people already knew it was false. I mean, knowing better helped, but it didn’t make anyone immune.

The detail campaigns care about most comes from a 2021 study. The biggest jump happens between the first time you hear something and the second. After that, each repeat of the phrase adds a little less. So basically, the work is done early.

The three moves behind a slogan

If repetition does the work, then a slogan’s entire job is to get repeated. There are three ingredients that surface time and again.

The beat. Short words, rhythm, and rhyme. In a 2000 study, people rated “woes unite foes” as more accurate than “woes unite enemies.” Same meaning. One rhymes. But when the researchers told people to separate how a saying sounds from what it says, most of that advantage went away. Noticing the beat is a defense on its own.

The verbless claim. Take “Sharper minds, safer streets.” It sounds like a principle, but there’s nothing in it you could check, and a claim you can’t check is hard to argue with. History has plenty of these from both parties. “I Like Ike” (Republicans, 1952) and “All the Way with LBJ” (Democrats, 1964) both won, both rhymed, and neither contained a policy.

The chorus. Often it starts with one person. The candidate says it, then the surrogates say it in the same words, then the lawn and billboard signs display it, and then the hashtags start popping up on social posts. A 2007 study found that one person repeating an opinion three times made it seem nearly as widely held as three different people saying it once. One voice, repeated, can sound like a crowd.

The tool: the Slogan Translation Test

Step 00: translate it. Say the slogan as a full sentence and ask four things. Who does it? What happens? By when? Paid for how? If you can’t do it in ten seconds, you haven’t been handed a position. You’ve been handed a feeling.

Then run steps 01 through 03, the Source Test. Stake: what would have to be true for the idea behind it to be a good one? Source: who wrote it, and why is everyone using the exact same words? Steelman: what’s the strongest honest version of the idea, said without the slogan?

The honest part

Look, slogans exist for a reason. A real policy doesn’t fit on a bumper sticker, and a good slogan can be an honest compression of a real position. Rhyme isn’t evil, and repetition helps true things stick too. The test doesn’t ask whether a slogan is good or bad. It asks whether there’s a real sentence underneath it.

So the next time four perfect words show up on a sign, don’t start by asking whether you agree. Translate them first.

Think Sharper. Stay Sovereign.