Sex difference research has been plagued with a myriad of problems,. Specifically, intelligence testing, if dependent on measurement of spatial or verbal proficiency, may not be an accurate indicator of native ability. Similarly, infrequent replication of studies, studies that only include subjects of one sex yet imply sex differences, and poor…

A discussion of the assumptions about the composition of intelligence which underlie preschool intervention efforts today offers theoretical evidence of a hierarchical arrangement of learning processes. International studies on cognitive development have concluded that the emergence of symbolic or conceptual thought occurs at a transitional age…