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Wilhelm creates the first psychology lab in Leipzig, Germany.

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James Mckeen is named the first psychology professor and taught at the University of Pennsylvania and Columbia.

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American Psychological Association was founded.

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Functionalism becomes a way to view psychology, promoted by William James and John Dewey.

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Psychoanalysis is created by Sigmund Freud.

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Edward B. Titchener creates the Structuralism view in psychology.

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Sigmund Freud publishes The Interpretation of Dreams.

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The British Psychological Society is created.

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Ivan Pavlov creates the first example of classic conditioning with experiments on his dog.

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John B. Watson published "pscychology as behavior" starting the behaviorism in psychology.

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Jean Piaget published The Child's Concept of the World, kickstarting the study of children's cognitive developments.

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Karen Horney published The Neurotic Personality of our Time. Which challenged most of Sigmund Freud's theories and ideas.

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Harry Truman signs National Mental Health Act that gives a lot of funding to mental health research.

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Gordan Allport publishes The Nature of Prejudice which is widely read by the public and helps use psychology to understand modern  social issues.

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Neuroscientist Wilder G. Penfield finds a relationship between chemical activity in the brain and psychology phenomena.

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Humanistic psychology emerges.

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Cognitive psychology emerges after George A. Miller's article in 1956 called The Magical Number Seven, Plus or Minus Two is released.

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Noam Chomsky published Syntactic Structures which created the psychology of language.

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Richard Dawkins published The Selfish Gene, which popularized evolutionary psychology.

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Jerome Bruner helped created cultural psychology.