In a series of studies about intellectual expectancies, Rosenthal and Jacobson (1968) found that schoolchildren randomly identified as "late bloomers" showed an average IQ increase of about 15 points by the end of the school year. These studies demonstrated ________.

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The studies conducted by Rosenthal and Jacobson showed the power of expectancies, as the simple act of being labeled a "late bloomer" caused an increase in IQ scores by the end of the school year.

In a Series of Studies About Intellectual Expectancies, Rosenthal and Jacobson