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THE EXTENT OF INDIVIDUAL DIFFERENCES
THE INFLUENCE OF INHERITANCE
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achievement adult appears average behavior Binet boys C. B. Davenport Cattell cent character chil child chronological age coefficients of correlation defective differences in mentality distribution E. L. Thorndike early Educational Psychology ences environment environmental experimental fact factors Francis Galton Galton genes genetic girls grade heredity human human variability identical twins important indi individual differences individual's infancy inferior influence innate intellectual ability intelligence quotient investigations Journal of Educational Journal of Psychology L. L. Thurstone learning measured mechanical ment mental ability mental age mental development mental growth curve mental tests mental traits mentally deficient motor musical nature Negro non-intellectual normal nurture Otis pairs parents performance persons physical present problem psychological tests racial rank regard relatively representative scale scores sensory sex differences siblings significant social superior Thorndike tion tt tt tt verbal vidual women York