The new level of existence of the spiritual requires a different set of rules,
one which is developed by the humanities and social sciences. The appropriateness of this must be continually re-examined in detail.
(The distinction between levels of existence and the phenomenon of emergence are dealt with in philosophical literature in the context of the theory of strata or stratification theory, of which Nicolai Hartmann is the best-known recent exponent, cf. N. Hartmann, Der Aufbau der realen Welt. Grundriß der allgemeinen Kategorienlehre, Berlin 1940, 3rd edition 1964.)
In the 3rd hypothesis, I rejected the concept of co-evolution of culture and brain. There is another reason for this rejection: Culture as an emergent characteristic belongs to the level of existence of the spiritual. That is why it could not even be present when the brain, which belongs to the biological stage of existence, developed.
Here I have shown where the boundary between the spheres of the biological and the spiritual runs.