Suchergebnisse

Data are presented on the social backgrounds and IQs of a sample of scientists, their male sibs and their fathers. The range of IQ in the scientists is similar to the range of scores expected of the higher 25% of a representative general population sample.The IQs of the scientists showed a positive correlation with social class. Differences in IQ between the scientists and their fathers in each social class are related to the distance the scientists have moved up the social scale. In the twenty-two families in which the IQs of the father and two male sibs are known the upwardly mobile sibs tend to have higher IQs than the non-mobile or downwardly mobile sibs.In Class II there is evidence that stabilizing selection operates on IQ to maintain the mean IQ level. The effect on social stratification of such selection, together with increased educational opportunity, is discussed.

SummaryThis study examines the relationship between verbal, performance and total IQ scores and social class of 193 male householders living in a Cambridge suburb. The correlation coefficients between IQ scores and present occupational status were significantly higher than the correlations between IQ scores and social class of origin, suggesting that intragenerational social mobility is positively related to IQ.Parent–offspring data were available for 85 father–son pairs. Analysis of the IQ differences between fathers and sons in relation to their social class differences provided further evidence for selective migration related to both IQ components and total IQ scores. In this sample there was a simple relationship between the extent of social mobility and the degree of difference between the father's and son's IQ scores.

Data are presented on the verbal and performance (non-verbal) IQs of a sample of university scientists, their surviving fathers and male sibs.Although mean IQs differ between scientific disciplines the disciplines do not differentially attract scientists from particular socio-economic classes.The verbal IQs of both the scientists and their fathers are positively correlated with socio-economic class but only in the fathers' sample is the performance IQ/class correlation significant. The variance of both verbal and performance IQs increases from Class I to Class IIIM. The overall estimate of heritability for the verbal IQ is higher than that for the performance IQ.Verbal and performance IQs are related to the distance the scientists have moved on the socio-economic scale. The effects of social mobility on the genetic and environmental components of the verbal and performance IQ phenotypic variances are discussed.