On the relationship between Gf/Gc theory and Jensen's Level I/Level II theory.

Gave 201 14–16 yr old urban Australian students in 6 Catholic high schools a battery of 27 ability tests strategically chosen to provide composite measures of 12 primary mental abilities selected to indicate 2nd-order abilities known as fluid intelligence (Gf), crystallized intelligence (Gc), and short-term acquisition retrieval (SAR). Factor analysis of the 12 primaries provided evidence of the Gf, Gc, and SAR dimensions. The SAR dimension is similar to a Level I form of intelligence (LI) and the Gf and/or Gc factors relate to a Level II intelligence (LII) in a theory sponsored by A. R. Jensen (1973, 1974). Analyses of social class differences in respect to SAR (LI) in contrast to Gf and Gc (LII) did not provide convincing evidence in support of a hypothesis that the social classes differ primarily in respect to LII (Gf and Gc) rather than in respect to LI (SAR). (50 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)