PsychologicalDUAL-USE

Rhyme-as-Reason Effect

What it is

A statement that rhymes is judged more accurate than the same statement reworded without the rhyme, because the ease and pleasure of the form are mistaken for the soundness of the content.

How it works

McGlone and Tofighbakhsh gave students unfamiliar aphorisms either in rhyming form (“woes unite foes”) or in a reworded version with the same meaning (“woes unite enemies”) and asked how accurately each described human behaviour. The rhyming versions were rated as more accurate, although the same students, asked directly, denied that rhyme has anything to do with truth. When participants were first warned to separate what a saying claims from how it sounds, the advantage disappeared. The authors called it the Keats heuristic, after “beauty is truth, truth beauty”: an aesthetic property of the wording is read as a property of the claim. The mechanism is processing fluency. Rhyme makes a phrase easier to parse, predict and repeat, and that ease is attributed to the content. Rhyme also makes a phrase easy to remember and to say aloud in unison, so it is retrieved often, and each retrieval adds the familiarity that feeds the illusory truth effect. Filkuková and Klempe later found the same advantage for rhyming advertising slogans.

Real-world examples

  • •Johnnie Cochran's “If it doesn't fit, you must acquit” in the 1995 O. J. Simpson closing compressed a contested evidentiary point into a rhyme that jurors and the public could repeat; McGlone has cited it as the effect in a courtroom.
  • •Political slogans on all sides rely on it: “I like Ike” for Eisenhower in 1952, “All the way with LBJ” in 1964, and the anti-war chant “Hey, hey, LBJ, how many kids did you kill today?” turned against the same president.
  • •Wartime and public-safety messaging uses rhyme for legitimate ends — “Loose lips sink ships” in the Second World War, “Click it or ticket” for seat-belt enforcement in the United States.
  • •Folk-health and financial maxims such as “an apple a day keeps the doctor away” and “sell in May and go away” are repeated as knowledge largely because they are easy to repeat.
  • •Advertising jingles and rhymed taglines are standard because, as Filkuková and Klempe's 2013 experiments found, rhyming slogans are rated as more trustworthy and persuasive than non-rhyming equivalents.

Ethical guidelines

Where the line is

Putting a true, useful message into rhyme so that people remember it is legitimate craft; putting a contested or false claim into rhyme so that it is accepted and repeated without examination, because the form supplies a feeling of accuracy the evidence does not, is manipulation.

  • ●Use rhyme to make a true and useful instruction stick — safety rules, drug-interaction warnings, mnemonics — where memorability serves the listener.
  • ●Do not compress a contested or false claim into a rhyme so that its form does the work its evidence cannot.
  • ●In legal, medical and financial settings, follow any rhymed summary with the unrhymed argument and the evidence, and invite the audience to judge that.

How to defend against it

  • ►Paraphrase it. Restate the slogan in plain, non-rhyming words and ask whether it still seems true; this is the manipulation check McGlone and Tofighbakhsh used, and it removes the effect.
  • ►Ask what the evidence is for the conditional. “If it doesn't fit, you must acquit” is a claim about what one piece of evidence implies; say the claim without the rhyme and evaluate that.
  • ►Notice when a maxim is doing the work of an argument in your own reasoning, especially about money and health, and look up whether the underlying regularity exists.
  • ►When a chant or jingle is stuck in your head, recognise that its availability is a product of its form, and count each repetition as one source rather than many.

References

  1. McGlone, M. S., & Tofighbakhsh, J. (2000). Birds of a feather flock conjointly (?): Rhyme as reason in aphorisms. Psychological Science, 11(5), 424-428
    Rhyming aphorisms were judged more accurate than reworded non-rhyming versions; a warning to separate form from content removed the effect.
  2. McGlone, M. S., & Tofighbakhsh, J. (1999). The Keats heuristic: Rhyme as reason in aphorism interpretation. Poetics, 26(4), 235-244
    The earlier statement of the Keats heuristic: aesthetic form taken as a cue to truth.
  3. Filkuková, P., & Klempe, S. H. (2013). Rhyme as reason in commercial and social advertising. Scandinavian Journal of Psychology, 54(5), 423-431
    Rhyming advertising slogans were rated as more trustworthy and persuasive than non-rhyming versions.
  4. Alter, A. L., & Oppenheimer, D. M. (2009). Uniting the tribes of fluency to form a metacognitive nation. Personality and Social Psychology Review, 13(3), 219-235
    Places the rhyme effect within the general processing-fluency account.
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