„Reading and math gaps grow substantially more in the first five years of life than they do in the nine years after school begins. This finding is consistent with neurocognitive research showing that the brain is more plastic at younger ages.“
Univ.-Prof. Dr. Paul T. von Hippel u. a., Do Test Score Gaps Grow Before, During, or Between the School Years? In: Sociological Science 6 (2019), S. 75.