Psychology - scienti c study of behaviour and the mind. Wilhelm wundt (1832-1920) established the rst experimental psychology laboratory at the university of leipzig in germany. Behaviour - refers to actions and responses that we can directly observe. Mind - internal states and processes, such as thoughts and feelings, that cannot be seen directly and that must be inferred from observable, measurable responses. Clinical psychology - the study and treatment of mental disorders. Cognitive psychology - the study of mental processes, such as consciousness, attention, memory, decision-making and problem solving. Psycholinguistics is a subsection of cognitive psychology that looks at language. Biopsychology - the study of the biological underpinnings of behaviour. Examines how brain processes, genes and hormones in uences our thoughts, actions and feelings. Developmental psychology - examines human physical, psychological and social development across a lifespan. Experimental psychology - focuses on such basic processes as learning, sensors systems (hearing and vision), perception and motivational states (hunger, thirst).