Psychologically, interactionism refers to the theory that the mind is composed of two separate entities, mind and body, each of which affects the other.
For instance, the mind can visualize actions (such as a sports performance) that the body can then emulate. Likewise, exercise activates endorphins that can cause a mental "high" that is similar to drug use and causes a person can feel good. In sociology, interactionism becomes a theoretical perspective that tries to derives social processes from human interactions. These processes (such as conflict, cooperation, or identity formation) are examined as a study of how individuals can shape their society and are likewise shaped by society.