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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
Recent work with the 42 mental ability tests administered to participants of the Minnesota Study of Twins Reared Apart (MISTRA) has suggested that there are important dimensions of mental ability that function independently of "g". Two of these dimensions, rotation-verbal and focus-diffusion, appear to involve trade-offs: greater…
Descriptors: Cognitive Ability, Verbal Ability, Brain, Intelligence
Download full textPezzullo, Thomas R.; Madaus, George F. – 1971
A study of twins was conducted to determine the presence of an hereditary component in short term memory and in three aspects of verbal divergent thinking--flexibility, fluency, and originality. Results showed the existence of a significant genetic component in the trait of short term memory, while none was found in verbal divergent thinking. (AG)
Descriptors: Biological Influences, Cognitive Processes, Creative Thinking, Divergent Thinking
