This paper compares different theoretical models of the structure of intelligence, based on the analysis of data obtained in a series of measured abilities corresponding to the Spectrum assessment activities (Gardner, Feldman & Krechevsky, 1998) in a sample of 393 children enrolled in kindergarten and first grade. The data were analyzed using…

Marked gender differences in three-dimensional mental rotation have been broadly reported in the literature in the last few decades. Various theoretical models and accounts were used to explain the observed differences. Within the framework of linking item design features of mental rotation tasks to cognitive component processes associated with…

Cross-cultural generalizability of Cattell's triadic theory of ability structure was examined for Hebridean, Ugandan, Canadian Eskimo, and native Indian samples. Four of the six postulated second-order capacities were found as well as a Piagetian conservation factor. At a most global order of generality, two larger, third-order factors were found.…