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G. Stanley Hall becomes the first American to earn a Ph.D. in psychology. He would eventually found the American Psychological Association.
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Wilhelm Wundt established the first experimental psychology lab in Leipzig, Germany dedicated to the study of structuralism. The event is considered the starting point of psychology as a separate science.
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G. Stanley Hall opens the first experimental psychology lab in the U.S. at John Hopkins University.
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Herman Ebbinghaus publishes his seminal "Über das Gedächtnis" ("On Memory") in which he describes learning and memory experiments he conducted on himself.
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Sigmund Freud begins offering therapy to patients in Vienna, Austria.
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James McKeen Cattell becomes the first professor of psychology at the University of Pennsylvania. He would later publish "Mental Tests and Measurements" marking the advent of psychological assessment.
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William James publishes "Principles of Psychology." Sir Francis Galton establishes correlation techniques to better understand the relationships between variables in intelligence studies.
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G. Stanley Hall forms the American Psychological Association (APA), enlisting 42 members
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Alfred Binet forms the first psychology lab devoted to psychodiagnosis.
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Edward Thorndike develops the Law of Effect.
What is the Law of Effect?
(https://www.verywellmind.com/what-is-the-law-of-effect-2795331)