Psychology

Psychology is the science that studies the mind and the nature of humans and animals. It examines how people perceive, remember, learn, feel, make decisions, and interact with one another. The term derives from two Greek words: 'psyche' (soul or mind) and 'logos' (science or discourse).

Psychology employs scientific methods: controlled experiments, observation, questionnaires, and statistical analysis of large datasets. It divides into two broad branches: basic research that seeks general laws of mental function, and applied work focused on addressing mental health problems and improving performance in work and education.

History

For a long time, questions about the mind were part of philosophy. In the nineteenth century, psychology emerged as an independent science when the mind began to be measured through laboratory experiments. Wilhelm Wundt is credited with establishing the first experimental psychology laboratory, founded in Leipzig in 1879. The twentieth century saw successive movements: psychoanalysis by Sigmund Freud, behaviorism which focused on observable behavior, and the cognitive revolution which revived the study of how the mind processes information.

Major branches

Cognitive psychology examines memory, attention, language, and problem-solving. Developmental psychology traces changes in people from infancy to old age. Social psychology studies how other people influence the individual, such as group conformity. Personality psychology attempts to define the stable traits that distinguish each person. Clinical psychology works on assessing and treating mental disorders, such as anxiety and depression.

Research methods

Researchers often use experiments comparing a control group and an experimental group to determine cause and effect. Other methods include longitudinal studies following people over time, and correlational studies examining relationships between two things without establishing causation. In recent years, the 'replication crisis' has become prominent—the finding that many previous results cannot be obtained again when experiments are repeated—leading to stricter standards for data quality and transparency.

Ethics and limitations

Research on people requires informed consent, protection of personal information, and minimization of potential harm. University ethics committees review projects beforehand. There is also debate about whether psychological knowledge has been drawn largely from narrow Western populations, raising questions about whether findings apply to all societies.