Like the subject of your thread. There is a lot of truth to be gleaned from studying our evolutionary development and the sudden unexplained
evolutionary leaps that have occurred.
If we also look at the development of the embryo , we also see that HUMAN embryo develops through similar stages as that of fish , birds and
The four principles of Karl Ernst von Baer. In 1828, von Baer reported, “I have two small embryos preserved in alcohol, that I forgot to label.
At present I am unable to determine the genus to which they belong. They may be lizards, small birds, or even mammals.” Figure 1.5 allows us to
appreciate his quandary. All vertebrate embryos (fish, reptiles, amphibians, birds, and mammals) begin with a basically similar structure. From his
detailed study of chick development and his comparison of chick embryos with the embryos of other vertebrates, von Baer derived four generalizations
(now often referred to as “von Baer's laws”), stated here with some vertebrate examples:
Now I believe the comparitive size and existance of portions of the HUMAN brain have changed due to the resulting development of higher thinking and
consciousness. As I stated earlier , I believe certain types of manipulation of the HUAMN species through DNA and specific breeding programms has
occured. This may or may not have occured on planet.
Below is the paticular point in our evolution that this may have occured , the term " abruptly " is interesting :-
The prehominid ancestors of homo sapiens - Dryopithecus and Ramapithecus - appeared about 20 million years ago. They had brains which were no
bigger than monkey brains. For the next 17million years or so, practically no change in brain size occurred. About 3 million years ago the
'australopithecine hominids' appeared rather abruptly, with larger brains with 'cranial capacity' of about 500cc. The evolution of the hominid
brain to its present size is a relatively recent phenomenon... the greatest brain development occurred within the last 3 million years.
ex]Clinical Presentations :- The frontal lobes of the brain are associated with decision making and control of behavior, and the temporal lobes with
emotion and language.
Here now with regard to your post , it is also interesting to look at the psychopath and their brain physiology and consequential thinking, which is
absent when the reptilian brain is engaged. Here you can compare the stunning simularities between the two as far as behaviour goes:-
Reptilian system or 'R-complex' The R-complex the most primitive of the three is also known as the 'archipallium brain' or 'root brain'. It
consists largely of the 'brain stem', the 'basal ganglia', the 'reticular activating system' and the 'midbrain'. Functions of the R-complex
are related to physical survival and body maintenance - digestion, reproduction, circulation, breathing, response to stress and so on. The functioning
of the R-complex is activated when the organism perceives threat and the needs for survival and safety predominate. Functions related to the
instinctive behaviour patterns self-preservation include automatic behaviours of 'territorial instincts' or 'territoriality', social dominance and
ritualism, status maintenance, deception, tendency to follow precedent and resistance to change, awe for authority, social 'pecking order'
behaviour, compulsiveness, prejudice .
NOTE:- THESE BEHAVIOURS ARE QUITE PREVALENT IN THE WORLDS HIGHER DECISION MAKING ARENA'S
Below we see how distortions in frontal lobe development result in deviant or reptillian type behaviours :-
Brain scans of the antisocial people, compared with a control group of individuals without any mental disorders, showed on average an 18-percent
reduction in the volume of the brain's middle frontal gyrus, and a 9 percent reduction in the volume of the orbital frontal gyrus – two sections in
the brain's frontal lobe
Now there could be a case made that the experiment to advance the HUMAN mind through intervention has and is both in the process of further evolution
and as in the case of the Psychopath , reverting back to a pre-exising type.
This would cause a huge divergence in outlook towards how society should function , encompasing morality , empathy towards those that are suffering
and all aspects of resultant human behaviour.
So I believe that your post offers the window into an interesting area of study and thank-you for posting.