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Phineas Gage suffers brain damage. He had a rod stabbed through his frontal lobe and afterwards it changed his whole personality. This led to the finding that the frontal lobe plays a part in personality.

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Paul Broca discovered an area in the left frontal lobe that is key to language development. This furnished the proof of localization of brain function.

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Wilhelm Wundt founded the first formal laboratory of psychology. This is known as the beginning of modern psychology.

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The first laboratory of psychology is set-up at John Hopkins University. It established psychology as a science and helped train psychologists throughout the world.

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William James publishes, Principles of Psychology, the first psychology textbook. It shifted towards the association of central nervous problems caused by overlapping stimuli.

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Margaret Floy Washburn becomes the first woman to earn a Ph.D in psychology. She was the second woman to become APA president.

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van Pavlov publishes the first study about Classical Conditioning. It formed the basis of behavioral psychology and proved in theory that you could condition people to do anything.

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Sigmund Freud publishes, The Interpretation of Dreams. Started a theory of dreams and a method for interpreting them, which was a groundbreaking discovery for psychology.

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Edward Thorndike published his first article on animal intelligence, eventually leading to the theory of Operant Conditioning. It formed the basis for operant conditioning and did experiments on cats that discovered how cats could learn behaviors.

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William Stern developed a formula for the Intelligence Quotient (IQ). It showed one’s cognitive abilities and tested the intelligence of a human being in one test.

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John B. Watson published, Psychology as the Behaviorist Views It. Wrote that psychology was a branch of nature and that the goal was to predict and control behavior.

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Jean Piaget published The Language and Thought of the Child. It helps to understand the mind of growing children and how they develop.

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B.F. Skinner published The Behavior of Organisms. Proved that children's behavior could be impacted through positive or negative consequences.

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Karen Horney proposed the social-cultural perspective. She is known as the founder of feminine psychiatry and showed how gender impacts psychology.

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Erik Erickson published, Childhood and Society. First to show Freud’s theory of infantile sexuality could be expanded.

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The Code of Ethics for Psychologists is created by the American Psychological Association. Provides guidance for psychologists and gives them standards to work from.

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Abraham Maslow founded the Humanistic Perspective of Psychology. He developed the hierarchy of needs.

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Carl Rogers published On Becoming a Person. Founder of humanistic psychology and a client-centered approach to therapy.

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Howard Gardner introduced his theory on Multiple Intelligence. It opened a way of different thinking about human intelligence and developed six initial intelligences.

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DSM V is published. It’s keeps up to date with the criteria for diagnosing mental disorders.