As we approach Darwin Day, the question of human evolution needs to be put into a non-darwinian perspective: evolution as fact, but the theory still unknown.
The extraordinary difficulty of real theories of evolution can be seen from the study of world history in WHEE
There we see examples we could never have guessed at of the way a ‘macro process’ can act on the stages of populations via an immensely complex meta-genetic influence that can act intermittently over very long periods of time. It is impossible to fully grasp this kind of transformation with the inklings marginally visible in world history.
We are stuck the absurdity that massive mutations in synchronous action could have been behind language, mind, complex consciousness and much else.
This process, it seems, has to be able to scan organisms, and their fields of manifestation, and must act not only on organism physiologies but on the relationships of organisms.
The question reamins however of the genetic correlate if any in world history. We should suppose that some form of genetic transformation occurs in relation to more abstract form factors beyond the genetic.
It would help to see if there are any genetic factors correlated with the macro effect in history. In any case the complexity of human evolution at the level of speciation is simply beyond the capacity of Darwinian theory.
We can see the problem, mostly repressed in current views, of trying to modify parts inside greater wholes. Once we see the problem with random processes here the nature of the problem explodes into a strangely non-linear species of transformations of unknown sources. But in world history we see perhaps a slightly simpler variant: the interior changes in cultural factors in a short term transformation: this must act on a differential set of regions, modify subsets of that region, and all this over several centuries. We are outclassed as yet by this kind of complexity.