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Robert Yerkes created the Army Alpha and Beta tests to measure intelligence.
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Psychological Corporation created the first psychological test development company, allowing testing to take place in offices and clinics.
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Wolfgang Kohler published 'The Mentality of Apes'
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Anna Freud published her first book about her father's ideas on the treatment of children
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Jean Piaget published 'The Moral Judgment of children'
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Walter B. Cannon coined the term homeostasis and began research on the fight or flight phenomenon.
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Henry Murray published the Thematic Apperception Test.
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Wechsler-Bellevue Intelligence Test was published.
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The Canadian Psychological Associated was founded.
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Jean Piaget published 'Psychology of Intelligence' discussing his theories of cognitive development.
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Karen Horney published her feministic views of psychoanalytic theory, marking the beginning of feminism.
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The Diagnostic and Statistical Manual of Mental Disorders (DSM) was published by The American Psychiatric Association marking the beginning of modern mental illness classification.
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Chlorpromazine (Thorazine) first used in the treatment of schizophrenia.
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Leon Festinger proposed his theory of 'Cognitive Dissonance' and later became an influence figure in Social Psychology.
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Alfred Bandura introduced the idea of Observational Learning on the development of personality. Lawrence Kolberg introduced his ideas for the sequencing of morality development.
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Howard Gardner (professor at Harvard University) introduced his theory of multiple intelligence, arguing that intelligence is something to be used to improve lives not to measure and quantify human beings.
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Deep Blue, the supercomputer at the time, beats the World's best chess player, Kasparov, marking a milestone in the development of artificial intelligence.
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New Mexico becomes the first state to pass legislation allowing licensed psychologists to prescribe psychotropic medication.