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.

Text adapted from: History

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