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| Journal of Genetic Psychology | 2 |
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Peer reviewedMatheny, Adam P., Jr.; And Others – Journal of Genetic Psychology, 1976
Summary scores for behaviors rated on Bayley's Infant Behavior Record were obtained by summing sequential ratings for same-sex twins participating in a longitudinal study. Composite scores were calculated for two behavioral clusters - one composed of behaviors related to primary cognitions and the other of behaviors related to extraversion.…
Descriptors: Cognitive Development, Heredity, Infant Behavior, Infants
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
