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Understanding the Rosenthal Effect (Pygmalion Effect)

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  1. Definition

    A phenomenon where expectations about a person influence that person's actual behavior and performance, ultimately causing the outcome to match the expectation. It is also called the "Pygmalion effect," named after the Greek myth in which a sculptor falls in love with a statue and brings it to life.

  2. Overview of the Oak School Experiment

    In 1968, psychologist Robert Rosenthal and principal Lenore Jacobson gave students at an elementary school an intelligence test, then β€” regardless of the actual results β€” randomly told the homeroom teachers that a subset of students were "expected to show significant academic improvement." At the end-of-year retest, these students showed greater score gains than the others.

  3. Impact on Education

    This experiment spread a widely held view across education that teacher expectations can unconsciously shape how much attention, feedback, and encouragement they give a student, in turn affecting actual academic achievement β€” and it is frequently cited to support the principle that "high teacher expectations matter."

  4. The Effect-Size Debate in Replication Studies

    The original experiment has faced criticism over methodological issues β€” how test score ceilings and floors were handled, the lack of a pre-registered hypothesis, and its statistical methods β€” and later replication studies have not consistently reproduced an effect as strong as the original, making it a frequently cited case in psychology's replication debate. However, some later meta-analyses in military and corporate settings have reported even larger, more stable effect sizes, so the debate centers less on whether the effect exists and more on its size and the conditions under which it appears.

  5. The Opposite Phenomenon: The Golem Effect

    The opposite of the Rosenthal effect β€” where low expectations lead to genuinely lower performance β€” is called the "Golem effect." Both phenomena are discussed together as examples of the self-fulfilling prophecy, where expectations shape outcomes.

  6. A Caution for Practical Application

    Given the ongoing academic debate over the effect's size and reproducibility, the general recommendation in educational psychology today is not to oversimplify it as "expectations alone guarantee better performance," but to pair well-founded encouragement with specific, concrete feedback.

What Is the Rosenthal Effect?

The Rosenthal effect is a classic example of the self-fulfilling prophecy, where expectations about a person influence their actual behavior and performance, causing the outcome to match the expectation. It became widely known through the Oak School experiment, which examined how teacher expectations affect student achievement, though as covered above, academic debate over the size of the effect continues.

Also See the Theory of Learning Through Observation and Imitation

If expectations shape behavior, observation is also a key route through which people learn new behavior. See our guide to Bandura's Social Learning Theory to learn the principles of observational learning.

Frequently Asked Questions

Is the Oak School experiment's result still fully accepted today?

The original experiment has been criticized for methodological issues β€” including how test score ceilings and floors were handled and its statistical approach β€” and later replication studies have not consistently reproduced an effect as strong as the original, making it a frequently cited case in psychology's replication debate. That said, some later meta-analyses in military and corporate contexts have reported considerable effect sizes.

What effect does low expectation have?

The opposite of the Rosenthal effect β€” where low expectations actually lead to lower performance β€” is called the "Golem effect." Both phenomena show that others' expectations can unconsciously shape attitudes and behavior enough to change real outcomes.