The pursuit of a science of mind has been marked by persistent conceptual tension. At one pole, exemplified by Piaget, the mind is characterized in terms of overarching principles. At the other end of the continuum, theory is more concerned with modeling particulars, as represented by the information processing model. This paper explores the…

Whether "psychometric" and "Piagetian" kinds of intelligence are similar is a question of whether they have similar courses of development with age. When using factor analysis to address this issue, age effects must be eliminated in order to assess relations among measured constructs. Reanalyses of previous results were…