With such steady growth, it has become very beneficial to the scientific community. The study of the human mind, learning, and behavior has shaped psychology as it is viewed today. The work of many eminent psychologists should never go unnoticed. The works of Ivan Pavlov have truly revolutionized the study and method to which many psychologists undergo. According to Specter, classical conditioning has made it possible not only to understand the actions of animals but also to cure psychiatric disorders and phobias. The connection between psychology and physiology, which was one of Pavlov's main goals, can be linked to the birth of psychology. The use of fMRI in today's medical treatments has enabled enormous opportunities to study neurons in the brain and how they influence behavior. He is undoubtedly a very important person