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At the end of 1859 Darwin's publication of On the Origin of Species explained natural selection in detail and presented evidence leading to increasingly wide acceptance of the occurrence of evolution. http://en.wikipedia.org/wiki/Evolution
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Ivan Sechenov's Reflexes of the Brain was published. This introduced the concept of inhibatory responses in the central nervous system.
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Edward Thorndike developed the 'Law of Effect' which is part of the social learning theory.
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Ivan Pavlov publishes his findings regarding classical conditioning (aka Pavlovian conditioning).
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John B Watson & Rosalie Rayner experiment with clasical conditioning
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The collapse of the New York Stock Market and causes the depression - depression follows next year in Europe
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Begining of Cognitive theory
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Psychodynamics was initially developed by Ernst von Brücke, Sigmund Freud, Carl Jung, Alfred Adler and Melanie Klein.[6][5] By the mid 1940s and into the 1950s, the general application of the "psychodynamic theory" had been well established.
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