Psychologists seek to understand and explain thoughts, emotions, feelings, and behaviour. Depending on the topic of study, psychologists use techniques such as observation, assessment, and experimentation to develop theories about the beliefs and feelings that influence a person’s actions.
Psychologists often gather information and evaluate behaviour through controlled laboratory experiments, psychoanalysis, or psychotherapy. They also may administer personality, performance, aptitude, or intelligence tests.
They look for patterns of behaviour or cause-and-effect relationships between events, and use this information when testing theories in their research or treating patients.