The anatomically layered structure of a human brain results in leveled functions. In all these levels of different functions, comparison, feedback and imitation are the universal and crucial mechanisms. Languages, symbols and tools play key roles in the development of human brain and entire civilization.
@article{arxiv.1802.01980,
title = {Layered structure and leveled function of a human brain},
author = {Shengyong Xu and Jingjing Xu and Rujun Dai},
journal= {arXiv preprint arXiv:1802.01980},
year = {2018}
}