What is the function of positive psychological suggestion?

Positive psychological suggestion is called Rosenthal effect.

Rosenthal effect, also known as "pygmalion effect effect" and "interpersonal expectation effect", is a kind of social psychological effect, which refers to the phenomenon that teachers' earnest hope for students can get the expected effect dramatically. It was discovered by American psychologists Rosenthal and L Jacobson through experiments in 1968. Generally speaking, this influence is mainly because teachers have different behavior expectations for high achievers and low achievers and treat them in different ways, thus maintaining their original behavior patterns.

Extended data:

1968 One day, American psychologists Rosenthal and L. Jacobson came to a primary school and said that they would conduct seven experiments. They selected three classes from Grade One to Grade Six, and conducted a "future development trend test" for the students in this 18 class. After that, Rosenthal handed a list of "most promising people" to the principal and related teachers in a favorable tone, and told them to keep it secret so as not to affect the correctness of the experiment.

In fact, Rosenthal told an "authoritative lie" because the students on the list were randomly selected. Eight months later, Rosenthal and his assistants re-examined the students in Class 18. As a result, a miracle appeared: all the students on the list made great progress in their grades, and they were lively and cheerful, confident and eager to learn, and more willing to deal with people.

Praise, trust and expectation have an energy that can change people's behavior. When a person gains the trust and praise of another person, he will feel that he has gained social support, thus enhancing his self-worth, becoming confident and self-respecting, gaining a positive motivation, and trying his best to meet the expectations of the other party, thus avoiding the disappointment of the other party and maintaining the continuity of this social support.

Baidu Encyclopedia-Rosenthal Effect