A psychologist is a person who studies normal and abnormal mental states, perceptual, cognitive, emotional, and social processes and behavior by experimenting with, and observing, interpreting, and recording how individuals relate to one another and to their environments.
Psychologists seek to understand and explain thoughts, emotions, feelings, and behavior. They use techniques such as observation, assessment, and experimentation to develop theories about the beliefs and feelings that influence individuals.Psychologists often gather information and evaluate behavior through controlled laboratory experiments, psychoanalysis, or psychotherapy. They also may administer personality, performance, aptitude, or intelligence tests. They look for patterns of behavior or relationships between events, and they use this information when testing theories in their research or when treating patients.