A Longitudinal Twin Study of Intelligence in the Second Year (Monographs of the Society for Research in Child Development)

This is a study of intelligence in children during the second year of life, examining the significance of developmental functions, individual differences, environmental effects and genetic influences. Using data from 408 pairs of twins, the study provides an analysis of the development of general intelligence. It looks at such components as expressive and receptive language abilities, non-verbal ability. visual attentiveness, and memory for locations.