1904 — The International Congress of Arts and Sciences began in St. Louis, Missouri, in conjunction with the St. Louis World's Fair. Speakers in seven divisions made presentations from September 19 to September 25. Psychologists were represented in the Division of Mental Sciences and included G. Stanley Hall, James McKeen Cattell, J. Mark Baldwin, Mary W. Calkins, Edward B. Titchener, C. Lloyd Morgan, John B. Watson, Pierre Janet, and Morton Prince.
1910 — Ledyard R. Tucker was born. Tucker developed three-mode factor analysis and inter-battery factor analysis, and contributed to test theory, structural equation modeling, and individual differences scaling models. APA Distinguished Scientific Contribution Award, 1987.
1917 — The Stanford Revision and Extension of the Binet-Simon Scale for Measuring Intelligence, commonly known as the Stanford-Binet Intelligence Test, was published.
1921 — Eric Lennenberg was born. Lennenberg's studies linked language acquisition and functions to the physiology of the brain and vocal apparatus.
1958 — The journal Human Factors was first published by the Human Factors Society. Stanley Lippert edited the journal.
1974 — The first APA Tennis Tournament began in Santa Fe, New Mexico. The tournament appears not to have endured as an annual event.
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