In a classic study by Robert Rosenthal and Leonore Jacobson,teacher expectations were shown to affect students' IQ scores.

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In the study commonly referred to as the Pygmalion effect, Rosenthal and Jacobson showed that when teachers were led to believe that certain students were likely to excel, those students did indeed show greater intellectual development over the course of the school year, including higher IQ scores.

In a Classic Study by Robert Rosenthal and Leonore Jacobson,teacher