Oddly Wired
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People perform better because you expect them to.

Higher performance expectations lead to improved outcomes for the individuals being observed.

In a 1968 study, teachers were told some students had high potential; those students showed greater intellectual growth, not because they were smarter, but because the teachers treated them differently. Your expectations become their reality.

Your view of others is a self-fulfilling prophecy.

Where this comes from

Study
Rosenthal and Jacobson, 1968
What the check found
The Pygmalion Effect is a well-known psychological concept based on the cited study, though the scientific robustness of the original 1968 results is frequently debated due to replication issues.
Confidence
Solid, with limits

Related

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