Bay·ley Scales of Infant Development (b  l )pl.n. Standardized tests used to assess the mental, motor, and behavioral progress of children during the first two and one-half years of life. |
Bayley Scales of Infant Development
Etymology: Nancy Bayley, twentieth century American psychologist
a three-part scale for assessing the development of children between the ages of 2 months and 2½ years. Infants are tested for perception, memory, and vocalization on the mental scale; sitting, stair climbing, and manual manipulation on the motor scale; and attention span, social behavior, and persistence on the behavioral scale.
Bayley Scales of Infant Development
Psychometric testing A revised standardization of the California First-Year Mental Scale, used in early stages of the Berkeley Growth Study, Bayley scales are applicable from birth to 15 months, measure
varying stages of growth at each age level, supplemented by extensive longitudinal data on groups of infants
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