One of the most remarkable traits of the human brain is its ability to retain something said by another person for years—or even a lifetime. This is particularly true when a teacher imparts a lesson or delivers a reprimand; the impact can last a lifetime. In simple terms, this is known as the "Teacher Effect," while in the realm of psychology, it is called the "Pygmalion Effect."

Let us explore what the Pygmalion Effect is and why its impact endures throughout one's life.

What is the Teacher Effect?
The Teacher Effect is a significant concept in education and psychology, positing that a teacher's qualities, behavior, and teaching style profoundly influence a student's future. To illustrate this: if a teacher holds high expectations for a student, that student’s performance tends to be equally outstanding.

Although this theory originated in the classroom, it is now applied in fields such as management, business, and sports psychology.

A Teacher's Words Leave a Lasting Impression
The Teacher Effect—or Pygmalion Effect—leaves a deep imprint on a student's mind. This explains why a teacher's praise or scolding is remembered for a lifetime. It is not merely a matter of memory; our brains often come to accept these words as truth. In psychological terms, this phenomenon is known as a "self-fulfilling prophecy."

For instance, if a teacher tells a student, "You are very promising," the child accepts this as true and strives to live up to that potential. Conversely, if a teacher remarks, "You know nothing," the child may view this as a prophecy, the impact of which shapes their future life.

First Identified in 1965
The Teacher Effect was first identified in 1965 by American educators Robert Rosenthal and Lenore Jacobson. For this reason, it is also known as the "Rosenthal Effect." They believed that a teacher's positive or negative expectations play a crucial role in either enhancing or diminishing a student's intellectual capabilities. This effect clearly demonstrates how the behavior and expectations of others directly influence an individual's capabilities.

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