Reply #47: there are biologically inate differences between different gene pools

[JackORoses]

and it is true that over time species develop inherited predispositions to stimulus.
For example, how does my Cocker Spaniel know to raise his leg and point at birds even though he has never been trained as a bird dog?
It's because his ancestors were trained as bird dogs and he has inherited this reflex.

It is foolish to think that similar processes do not exist within the human species.

Thus,
People of a culture and genetic pool that has passed down its History in writing for millenia will learn in different ways than people that have always passed their History down as an Oral Tradition.
A child from the first culture might learn more easily through written word, while a child of the other might perform better with spoken word.

Science can prove this.