Heredity and environment: a critical survey of recently published material on twins and foster children, Issues 47-48
Social Science Research Council, Jun 1, 1941 - Family & Relationships - 95 pages
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adult alike attributed average heredity average IQ birth Burks chance errors chil child's IQ children placed compared control group correlation defective differentiating discordant pairs dren effect environmental differences environmental factors estimated evidence feebleminded foster child foster children foster homes foster parents foster siblings fraternal twins gain gence genetic heredity and environment home environment hypothesis identical twins reared identicals reared importance individual differences inferior intellectual intelligence quotient intelligence tests inter-family variation intra-pair difference investigators Iowa IQ difference IQ variance mean IQ measured ment mental development mentally deficient mothers Newman nursery school occupational level orphanage ovum pairs of identicals parentage population prenatal and natal probably promising children Psychol question relatively retest same-sex fraternals sample selective placement shares of heredity siblings reared Skodak social environment statistical study of foster superior tion traits twin method twin studies unlike-sex variable variation in heredity vironment whole Yearbook Nat