In the seattle longitudinal study, the most dramatic decrease in a specific domain is in which actually begins to significantly decrease in emerging adulthood. inductive reasoning numeric ability verbal ability perceptual speed

Main focus of the Seattle Longitudinal Study is on individual change and stability in intelligence.
In the Seattle longitudinal study, the most dramatic decrease in a specific domain is in perceptual speed which actually begins to significantly decrease in emerging adulthood. Perceptual speed denotes the ability to quickly and accurately make simple discriminations in visual stimuli.