Processing Speed Mediates the Development of General Intelligence (g) in Adolescence
Thomas R. Coyle, David R. Pillow, Anissa C. Snyder, and Peter Kochunov; 2011
In the research reported here, we examined whether processing speed mediates the development of general intelligence (g) in adolescence. Using the Armed Services Vocational Aptitude Battery, a battery of 12 diverse cognitive tests, we assessed processing speed and g in a large sample of 13- to 17-year-olds obtained from the National Longitudinal Survey of Youth (N = 6,969). The direct effect of age on g was small compared with the total effect of age on g, which was almost fully mediated through speed. The results suggest that increases in g in adolescence can be attributed to increases in mental speed.
Clocking the mind: Mental chronometry and individual differences; A. R. Jensen; 2006