People who study psychology are usually helpful to understand micro-expressions, because they are usually trained in human thinking, emotion and behavior. However, even people who study psychology can't completely control their micro-expressions. Micro-expression is a natural expression of people's inner feelings, which is often not controlled by consciousness. Although people can try to hide or change their micro-expressions, it requires a lot of practice and special training.

In addition, understanding and recognizing micro-expressions requires specialized knowledge and skills. Only through specialized training, such as specialized courses in psychology or related research, can these skills be acquired. Therefore, even people who study psychology may need extra training to effectively control micro-expressions.