The evolution of human cognition is actually the evolution of the relationship between group consciousness and individual consciousness in a two-dimensional entropy reduction system. The evolutionary trend, in fact, is very clear, that is, the entropy reduction ability of the group is getting stronger and stronger (manifested in the coverage of the group consensus), on the other hand, the entropy reduction ability of the individual is also getting stronger and stronger (manifested in the influence of the individual consciousness to the outside more and more, the explosion of modern science and technology is actually the liberation of individual consciousness).