When people who score extremely high or low on some trait are measured a second time and their new scores fall closer to the mean (or average), it is referred to as

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This phenomenon is known as regression toward the mean, where extreme scores tend to be less extreme upon a second measurement and move closer to the average or mean score. It is a statistical concept and has nothing to do with the law-of-averages, reaction formation or the placebo effect.

When People Who Score Extremely High or Low on Some