Clinical and counseling psychologists diagnose and evaluate mental and emotional disorders, using psychological tests and interviews.
Research or experimental psychologists study behavioral processes by conducting scientific research on human beings and animals.
A psychologist is a scientist who studies psychology, the systematic investigation of human behavior and mental processes.
Psychologists are usually categorized under a number of different fields, the most well-recognized being clinical psychologists, who provide mental health care, and research psychologists, who investigate and analyze various aspects of human behavior.
Ultimately, the purpose of psychologists is to understand human nature, and thus to help people overcome difficulties and fulfill their potential as true human beings.
Research psychologists generally have an academic doctoral degree (Ph.D.).
Psychologists also work in many other applied fields.
Such licensed psychologists can legally provide psychotherapy, and use this term to refer to aspects of the mental health treatments they perform.
The requirements are different from the professional degrees of medical doctors and clinical psychologists in that they include significant academic research experience and original contributions to scientific research in the form of a dissertation.