Published online by Cambridge University Press: 05 April 2006
Blair makes a strong case that fluid cognition and psychometric g are not identical constructs. However, he fails to mention the development of the prefrontal cortex, which likely makes the Gf–g distinction different in children than in adults.1 He also incorrectly states that current IQ tests do not measure Gf; we discuss several recent instruments that measure Gf quite well.
1. Whereas Blair used the abbreviation “gF” to denote fluid cognition, we have opted to use “Gf,” which is the abbreviation used by Cattell- Horn-Carroll (CHC) theorists and researchers.