- Aristotle theorized about learning, memory, motivation, emotion, perception and personality before 30 BC and was an early contributor to the study of psychology.
- Wilhelm Wundt established the first psychology laboratory in 1879 in Leipzig, Germany and is considered the father of modern psychology. He focused experiments on sensation and perception.
- Present day psychology incorporates many approaches including behavioralism, psychoanalytic theory, humanism, biopsychology, cognitive theory, and sociocultural psychology. Each approach provides a different perspective on understanding human behavior and mental processes.