Psychology Psychology is the scientific study of the mind, brain, and behaviour. It focuses on building and testing theories to help explain how people interact with each other and the world around them. Psychologists are interested in the way biological and social factors influence how we behave, and how interests and abilities differ from person to person. They also study how we perceive, think, and learn about the world around us. They examine how we communicate verbally and non-verbally, and how and why our mental abilities change across our lives. Psychology is an experimental and observational science, in which evidence from research studies is used to develop and evaluate theories.  Linguistics Linguistics examines how language works, describing how sounds, words, sentences and conversations combine to express and create meaning. It also studies the uses of language in everyday life, the ways in which it varies across society and evolves over time, and how it is mastered by children.