Oddly Wired
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perception

You can temporarily destroy the meaning of any word.

Semantic satiation is triggered by the high frequency of word repetition over a short period, rather than a specific 30-second threshold.

The effect is proportional to the number of repetitions, which can induce satiation in more or less time depending on the individual and the repetition speed.

Language is just a fragile link that your brain maintains through constant effort.

Where this comes from

Study
Leon James, 1962, Psychological Reports
What the check found
Semantic satiation is a well-documented phenomenon, but it is driven by the frequency and rate of repetition, not a specific 30-second interval.
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.