An investigation of Gf-Gc theory in the older adult population: joint factor analysis of the Woodcock-Johnson-Revised and the Detroit Test of Learning Aptitude-Adult.

Researchers and clinicians are increasingly interested in the structure of intelligence among older adults. A joint factor analysis was conducted for 27 subtests of the Woodcock-Johnson Psycho-Educational Battery-Revised and the Detroit Tests of Learning Aptitude-Adult for a sample of 50 persons ranging in age from 55 to 84 years (M=65.16 yr.). The results provide evidence for the latent factors speci fied by Gf-Gc theory in older adults, indicate which Gf-Gc factors are measured by subtests of the two batteries, and illustrate the necessity of cross-battery assessment to identify the full complement of Gf-Gc factors.