Oddly Wired
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psychology

Others perform better because you expect them to.

A 1968 study found that when teachers were told specific students were gifted, those students actually achieved higher IQ gains.

The Pygmalion effect shows that your expectations influence your behavior toward others. You inadvertently provide more support and feedback to those you believe will excel.

Your belief about someone else becomes their reality.

Where this comes from

Study
Rosenthal and Jacobson (1968)
What the check found
While the reference text confirms the study and its date, it lacks the specific findings. However, the Pygmalion effect is a well-established psychological phenomenon and the attribution to this study is correct.
Confidence
Solid, with limits
psychologysocial influenceexpectations

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.