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The Flynn Effect in Sibships: Investigating the Role of Age Differences between Siblings
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Sundet, Jon Martin; Eriksen, Willy; Borren, Ingrid; Tambs, Kristian – Intelligence, 2010
The aim of the study was to investigate the relationship between the Flynn effect and the effects of age differences between siblings on the intelligence difference between them. In Norway, the secular trends in intelligence-test score means vary both in magnitude and direction. We identified three periods: one period where the mean intelligence…
Descriptors: Intelligence, Siblings, Intelligence Quotient, Birth Order
Individual Differences in Intelligence: A Reappraisal of the Confluence Model.
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Galbraith, Richard C. – Intelligence, 1983
Support for the confluence model of intellectual development has come from analyses of family size-birth order means of large aggregate data sets. Analyses of individual scores do not substantiate the confluence model, as explained variance is markedly reduced. The study of family interaction variables utilizing longitudinal data is recommended.…
Descriptors: Birth Order, Environmental Influences, Family Influence, Family Size
Being a Closely Spaced Second Child Is Not So Bad. Child-Spacing Effects on Intelligence, Personality, and Social Competence.
Nuttall, Ronald L.; Nuttall, Ena Vazquez – 1978
This study focuses on the effects of family size and spacing on intellectual, social, and personality development of children. The sample consisted of 533 suburban, middle class, large family (five or more) and small two child family children. The children, 233 boys and 300 girls, were teenagers attending either junior or senior high school.…
Descriptors: Academic Aspiration, Age Differences, Behavioral Science Research, Birth Order