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| Journal of Genetic Psychology | 2 |
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Peer reviewedVery, Philip S.; Iacono, Carmine H. – Journal of Genetic Psychology, 1970
Analysis of the mental factors of seventh grade students indicates that numerical facility and perceptual speed are a single factor at this age level and that no purely verbal factor exists. Seven clearly differentiated factors are found for males and five for females. (Author/WY)
Descriptors: Abstract Reasoning, Cognitive Ability, Cognitive Processes, Intelligence
Download full textVan den Daele, Leland D. – Journal of Genetic Psychology, 1972
A classification of natal influences is proposed with a model of their operation. Natal influences affect maternal capacity, maternal load, and maternal efficiency. Since maternal load is increased in twin pregnancy, results of twin studies must be generalized with caution. The method of co-twin control is exemplified by examination of a small…
Descriptors: Bibliographies, Genetics, Heredity, Individual Characteristics
