Oddly Wired
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cognition

A rhyme makes a statement seem more truthful to you.

The rhyme-as-reason effect increases the perceived accuracy of a statement simply because it is phonologically pleasing.

In a 2000 study, participants consistently rated aphorisms that rhymed as more accurate than the same statements modified to be non-rhyming. The mental ease of processing the rhyme is misidentified as evidence of truth.

You find catchy slogans more credible than unrhymed arguments.

Where this comes from

Study
McGlone and Tofighbakhsh, 2000, Psychological Science
What the check found
The study by McGlone and Tofighbakhsh (2000) confirms that rhyme influences perceived accuracy (the 'rhyme-as-reason' effect) due to increased cognitive fluency.
Confidence
Well replicated

Related

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