They find evidence in the fact that the number and density of synapses (neural connections) peak at three years of age. Consequently, they argue that the first years of life are essential for education.
論述的依據是：由於嬰兒期腦細胞間的連結數量（突觸密度）會遽增，並於 3 歲達到高峰，因此推論這段「突觸新生歷程」或許正是學習的關鍵期。