Psychological knowledge is applied to various spheres of human activity, including issues related to everyday lifeâsuch as ...Psychological knowledge is applied to various spheres of human activity, including issues related to everyday lifeâsuch as family, education and employmentâand to the treatment of mental health problems. Psychologists attempt to understand the role of mental functions in individual and social behavior, while also exploring the underlying physiological and neurological processes. Psychology includes many sub-fields of study and applications concerned with such areas as human development, sports, health, industry, media and law. Psychology incorporates research from the natural sciences, social sciences and humanities. A person who studies or practices psychology is called a psychologist.Psychological knowledge is applied to various spheres of human activity, including issues related to everyday lifeâsuch as family, education and employmentâand to the treatment of mental health problems. Psychologists attempt to understand the role of mental functions in individual and social behavior, while also exp...