Psychology, the scientific study of observable behavior and unobservable mental processes, is a broad discipline that spans subject matter from biology to sociology. Psychologists study the intersection of two critical relationships: one between brain function and behavior, and one between the environment and behavior. As scientists, psychologists follow the scientific method, using careful observation, experimentation, and analysis.
The field of psychology encompasses both research and practice. Some psychologists work primarily as researchers, others work primarily as practitioners, and still others do both. One of psychology’s most unique and important characteristics is the coupling of science and practice, which stimulates continual advancement in both areas. Psychological researchers and practitioners strive to learn about human and animal behavior and to apply that knowledge in order to solve problems and promote healthy development.
This description of the field of psychology is paraphrased from the American Psychological Association's Brochure.
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