Unusual ESP subjects who defy chance when first tested nearly always lose their "psychic powers" when retested. This decline is best explained in terms of

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Regression toward the mean. Unusual ESP subjects who perform exceptionally well in a first test are likely to have experienced a chance occurrence that led to their success. When they are retested, they are likely to perform closer to their average level of performance, which is expected to be less impressive than their initial performance. This phenomenon is known as regression toward the mean.

Unusual ESP Subjects Who Defy Chance When First Tested Nearly