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Bayley, Nancy(1899– ) psychologist; born in The Dalles, Ore. She studied at the University of Iowa, then joined the University of California: Berkeley, where she directed the Berkeley Growth Study. This 40-year longitudinal study measured mental and motor development in 74 subjects from infancy into adulthood. She published four books and research aids, including the Bayley Scales of Infant Development (1969).
The Cambridge Dictionary of American Biography, by John S. Bowman. Copyright © Cambridge University Press 1995. Reproduced with permission.