Brother–sister differences in the g factor in intelligence: analysis of full, opposite-sex siblings from the NLSY1979

Deary, I.J., Irwing, P., Der, G. and Bates, T.C. (2007) Brother–sister differences in the g factor in intelligence: analysis of full, opposite-sex siblings from the NLSY1979. Intelligence, 35(5), pp. 451-456. (doi:10.1016/j.intell.2006.09.003)

Full text not currently available from Enlighten.

Publisher's URL: http://dx.doi.org/10.1016/j.intell.2006.09.003

Abstract

There is scientific and popular dispute about whether there are sex differences in cognitive abilities and whether they are relevant to the proportions of men and women who attain high-level achievements, such as Nobel Prizes. A recent meta-analysis (Lynn, R., and Irwing, P. (2004). Sex differences on the progressive matrices: a meta-analysis. Intelligence, 32, 481–498.), which suggested that males have higher mean scores on the general factor in intelligence (g), proved especially contentious. Here we use a novel design, comparing 1292 pairs of opposite-sex siblings who participated in the US National Longitudinal Survey of Youth 1979 (NLSY1979). The mental test applied was the Armed Services Vocational Aptitude Battery (ASVAB), from which the briefer Armed Forces Qualification Test (AFQT) scores can also be derived. Males have only a marginal advantage in mean levels of g (less than 7% of a standard deviation) from the ASVAB and AFQT, but substantially greater variance. Among the top 2% AFQT scores, there were almost twice as many males as females. These differences could provide a partial basis for sex differences in intellectual eminence.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Der, Mr Geoffrey
Authors: Deary, I.J., Irwing, P., Der, G., and Bates, T.C.
College/School:College of Medical Veterinary and Life Sciences > Institute of Health and Wellbeing > MRC/CSO Unit
Journal Name:Intelligence
ISSN:0160-2896

University Staff: Request a correction | Enlighten Editors: Update this record