Steven G. Vandenberg

TL;DR: A paper-and-pencil test of spatial visualization was constructed from the figures used in the chronometric study of Shepard and Metzler (1971) as discussed by the authors, which showed substantial internal consistency (Kuder-Richardson 20 =.88), a test-retest reliability (83), and consistent sex differences over the entire range of ages investigated.

TL;DR: It is indicated that the observed similarity of spouses for most variables is due to initial assortment rather than to convergence of phenotypes after initial contact, and that spouses do appear to converge for highly plastic variables such as alcohol consumption and amount of social activity.

TL;DR: Four cognitive factors were extracted from test data obtained on 997 families (3,268 individuals) in Hawaii, and differential rates of cognitive development were indicated when the data were stratified by ethnicity.

TL;DR: Results of hierarchical multiple regression analyses, as well as the ordering of single-parent/single-child and sibling correlations, provide no evidence to support the hypothesis that spatial ability is influenced by a sex-linked, recessive gene.

TL;DR: These measures provide upper-bound estimates for the heritability of performance on the individual tests and factor scores in addition to a test of the hypothesis that spatial visualisation ability is influenced by a sex-linked major gene.