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Intelligence2
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Kaufman, Alan S.1
Loehlin, John C.1
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Differential Inheritance of Mental Abilities in the Texas Adoption Project.
Peer reviewed Peer reviewed
Loehlin, John C.; And Others – Intelligence, 1994
Correlations on subscales of Wechsler intelligence quotient tests and the Revised Beta Examination were obtained for biologically related and unrelated individuals in 181 adoptive families in the Texas Adoption Project. Generally higher correlations for biologically related individuals support the importance of genetic influence in intellectual…
Descriptors: Adopted Children, Adoption, Cognitive Ability, Correlation
Age and WAIS-R Intelligence in a National Sample of Adults in the 20- to 74-Year Age Range: A Cross-Sectional Analysis with Educational Level Controlled.
Peer reviewed Peer reviewed
Kaufman, Alan S.; And Others – Intelligence, 1989
Age differences in intellect as reflected in performance on the revised Wechsler Adult Intelligence Scale (WAIS-R) from age 20 to 74 years were evaluated for 1,480 adults from the WAIS-R standardization sample, while educational levels were held constant. Implications of the results for intelligence testing are discussed. (SLD)
Descriptors: Adults, Age Differences, Cross Sectional Studies, Educational Attainment