Psychology

Processing fluency

Things that are easy to read, say and remember feel truer and more pleasant, which is why rhymes, short lines and simple pictures stick.

1888–2024Updated 26 October 2026

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Processing fluency: where it comes from

People judged rhyming sayings, such as "woes unite foes", as more accurate than the same ideas put without a rhyme (McGlone and Tofighbakhsh, 2000). Psychologists call the ease with which we take something in processing fluency: what feels easy also feels true.

In ads it shows up as rhymes, short lines, catchy rhythms and very simple pictures.