Oddly Wired
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communication

You trust a statement more if it rhymes.

The rhyme-as-reason effect makes you perceive rhyming phrases as more truthful than identical statements written in prose.

Rhyming increases processing fluency, which your brain misinterprets as credibility. Because the information is easier to retrieve and mentally rehearse, you assume the underlying content must be accurate. It is a shortcut for assessing validity.

Truth and catchiness are easily confused.

Where this comes from

Study
McGlone and Tofighbakhsh, 2000
What the check found
McGlone and Tofighbakhsh (2000) 'Birds of a feather flock conjointly: Rhyme as (reason in) aphorisms' is the correct seminal study supporting this effect.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.