What is Psychology?
Psychology is the scientific study of the mind and behaviour. The word comes from the Greek psyche ("breath, spirit, soul") and logia ("study of"). It is both an academic discipline and a professional practice: the American Psychological Association defines it as the scientific study of individuals' behaviour and mental processes, while the British Psychological Society frames it as the study of people, the mind, and behaviour. At its core, psychology is about understanding why people think, feel, and act the way they do.
A Brief History
Questions about the mind are ancient — Greek philosophers such as Plato and Aristotle wrote about it, and the Greek physician Hippocrates argued as early as the 4th century BC that mental disorders had physical rather than supernatural causes. Similar threads run through Chinese philosophy (Confucius, Laozi) and Indian thought, particularly the Upanishadic distinction between the transient self and the eternal soul, later explored further through yoga and meditation.
Psychology became a distinct science in 19th-century Europe. Wilhelm Wundt's experimental laboratory in Germany is often cited as the formal beginning of psychology as an experimental discipline, and the field grew rapidly through the 20th century into the many schools of thought summarised below.
Major Schools of Thought
Biological Psychology
Also called physiological psychology or neuropsychology, this school studies the biological basis of behaviour and mental processes — how the brain, nervous system, and genetics shape what we think and feel. It asks how far mental functions can be traced to specific areas of the brain.
Behavioural Psychology
Pioneered by figures like Ivan Pavlov and B. F. Skinner, behaviourism focuses on observable behaviour rather than internal mental states, studying how behaviour is learned and reinforced through conditioning.
Cognitive Psychology
Cognitive psychology studies mental processes such as perception, memory, reasoning, and problem-solving, treating the mind somewhat like an information-processing system. It underpins much of modern cognitive behavioural therapy.
Social Psychology
This school examines how people think about, influence, and relate to one another — covering topics like conformity, persuasion, group dynamics, and the formation of attitudes and stereotypes.
Psychoanalysis
Founded by Sigmund Freud, psychoanalysis explores the unconscious mind and its influence on behaviour, using methods like free association and dream interpretation. Carl Jung, a contemporary of Freud, developed his own related theory of the collective unconscious.
Humanistic & Existential Psychology
Emerging in the mid-20th century as a reaction to both behaviourism and psychoanalysis, this approach (associated with Abraham Maslow and Carl Rogers) focuses on the whole person — free will, self-actualisation, personal growth, and meaning.
Personality
Personality refers to a person's enduring patterns of thought, emotion, and behaviour. Different schools explain it differently — Freud emphasised the interplay of the id, ego, and super-ego, while trait theorists such as Hans Eysenck and Raymond Cattell tried to describe personality through a defined set of core traits (extraversion, neuroticism, and so on). Modern research increasingly treats personality as something that can shift and develop across a lifetime, rather than a fixed structure set in early life.