Nancy Bayley

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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).