Gary Perlin, a psychologist in the former Soviet Union, was the first person to systematically study psychological skills. In 1959, he put forward the theory that psychological action is formed by stages.

(1) Gary Peilin's five-stage theory of psychological activity. The first stage is the basic stage of activity orientation. The second stage is the stage of material activity or materialized activity. The third stage, the stage of speaking with voice. The fourth stage, the silent "external" speech stage. The fifth stage is the internal speech stage.

(2) The educational significance of Gary Peilin's five-stage theory of psychological activity. This theory emphasizes that the learning process of mental skills is an internalization process from the outside to the inside. Therefore, in the teaching of psychological skills, we should pay attention to the "internalization" process of psychological skills, and pay attention to the gradual learning, which can not span one or some stages.