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1911 Edward Thorndike published first article on animal intelligence leading to the theory of Operant Conditioning.
1912 William Stern developed the original formula for the Intelligence Quotient (IQ) after studying the scores on Binet’s intelligence test.
1917 Robert Yerkes (President of APA at the time) developed the Army Alpha and Beta Tests to measure intelligence in a group format. 1921 Psychological Corporation launched the first psychological test development company, not only commercializing psychological testing, but allowing testing to take place at offices and clinics rather than only at universities and research facilities.
1935 Thematic Apperception Test (TAT) was published by Henry Murray.
1936 Egas Moniz published his work on frontal lobotomies as a treatment for mental illness.
The tests were adopted for use with all new recruits in the U. 1925 Wolfgang Kohler published ‘The Mentality of Apes’ which became a major component of Gestalt Psychology.
1927 Anna Freud, daughter of Sigmund Freud, published her first book expanding her father’s ideas in the treatment of children.