- The constant repetition of a meaningless word or phrase.
- The duration of a mental impression, measured by the rapidity with which one impression follows another as determined by the revolving of a two-colored disc.
- In clinical psychology, the uncontrollable repetition of a previously appropriate or correct response, even though the repeated response has since become inappropriate or incorrect.
[L. persevero, to persist]
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Examples: glitazone, GI cocktail, etc.