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

Lazar Stankov, John L. Horn, Trevor Roy
1980 Journal of Educational Psychology  
A sample of 201 high school students was given a battery of 27 ability tests strategically chosen to provide composite measures of 12 primary mental abilities selected to indicate second-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
more » ... and/or Gc factors relate to a Level II intelligence (LII) in a theory sponsored by Jensen. 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).
doi:10.1037/0022-0663.72.6.796 fatcat:ttrlaron4rcv5fvfock6cdvkiq