Brains are most amenable to reading development in the first two years of primary educationThe regions that form the reading network in the brain mainly develop in the first two years of primary school. After that, the growth of these brain regions stabilises. This has been shown by a year-long study conducted by KU Leuven. Neurobiological differences in dyslexia are already present at pre-school age The regions that form the reading network in the brain mainly develop in the first two years of primary school.