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Direct linkJohnson, Wendy; Bouchard, Thomas J.; McGue, Matt; Segal, Nancy L.; Tellegen, Auke; Keyes, Margaret; Gottesman, Irving I. – Intelligence, 2007
In previous papers [Johnson, W., & Bouchard Jr., T. J. (2005a). Constructive Replication of the Visual-Perceptual-Image Rotation (VPR) Model in Thurstone's (1941) Battery of 60 Tests of Mental Ability. Intelligence, 33, 417-430.] [Johnson, W., & Bouchard Jr., T. J. (2005b). The Structure of Human Intelligence: It's Verbal, perceptual, and image…
Descriptors: Intelligence, Twins, Genetics, Environmental Influences
Johnson, Wendy; Bouchard, Thomas J., Jr. – Intelligence, 2007
Empirical data suggest that there is at most a very small sex difference in general mental ability, but men clearly perform better on visuospatial tasks while women clearly perform better on tests of verbal usage and perceptual speed. In this study, we integrated these overall findings with predictions based on the Verbal-Perceptual-Rotation (VPR)…
Descriptors: Gender Differences, Cognitive Ability, Visual Perception, Verbal Ability
Peer reviewedRodgers, Joseph Lee; And Others – Intelligence, 1994
An adaptation of the multiple regression approach of De Fries and Fulker (DF analysis) is used to account simultaneously for genetic and environmental influences on achievement. The model was fitted to achievement measures of 1,044 related pairs of children from the National Longitudinal Study of Youth (NLSY). (SLD)
Descriptors: Academic Achievement, Children, Environmental Influences, Genetics
