These kinds of interventions typically produce
cognitive gains that
last a few years and then fade — but, more important, also produce better life outcomes, such as less crime, fewer teenage pregnancies, higher high school graduation rates, and higher incomes.
Many studies show that
cognitive gains for children who attended high - quality preschool
last into early elementary school and adolescence, while others have identified a convergence of achievement scores between children who attended high - quality pre-K and those who did not by third grade.