It takes more thought

It takes more thought to create more brain matter connections and it takes more brain matter connections to create more thought.

Genetically one can inherit many brain matter connections, but if thought is not cultivated the connections will not be fully utilized. If thought is cultivated and utilized to it fullest then brain matter connections will evolve to their full potential. The potential for brain matter connections depends on genetics, environment, nourishment, activity and more. The potential for thought depends on these same principals.

The environment or culture in which thought and brain connections develop contribute to what, how much, why, and how we think.