ABSTRACT
This chapter presents research on the relations between mental processes in development. Specifically, the chapter first summarizes research showing how the relations between processing speed and working memory, on the one hand, and reasoning, on the other, change with developmental phase. We showed that at the beginning of cycles reasoning relates with speed and attention control more than with working memory; at the end of each cycle this relation weakens while the relation with working memory strengthens. The chapter then presents a series of studies highlighting the mediating role of cognizance between executive and efficiency processes, on the one hand, and reasoning, on the other. It is shown that the mediation of cognizance between executive and reasoning processes is cycle-specific. That is, in each cycle it is exerted through the processes underlying the management of representation in each cycle. These are the perception-based aspects of representation in the representational cycle, rule-based inferential processes in the rule-based cycle, and abstract semantic processes in the principle-based cycle. The implications of these novel findings for cognitive, psychometric, and developmental theories of intelligence are discussed.
