A Few More Thoughts On Bipedalism?

Introduction
Testosterone and Neural Dysfunction
Some insights into the pineal and related bio-chemistry
Bio-chemistry overview and a bit on sleep
Some more thoughts on bipedalism

Dear, --

Have you come across any research directly or indirectly linking an extending post natal foetal like phase or relatively slow development in the infant stage to an adaptive pressure for becoming bi-pedal?

Would an increasingly long period of infant helplessness and increasing weight have been a factor in forcing a sustained period of efficient ground dwelling at least in adult females caring for young, that in turn brought about pressures to be upright? The arms for climbing/walking on all fours become the external uterus for a heavier bundle that is increasingly too heavy/helpless to safely carry into the canopy.

Could these same factors have created a window of pressure toward bipedal/upright stance not in the adult but in the infant stage.

• No longer developed enough to take to the trees for an increasingly long period, big enough to be left to attempt to move around on the ground.
• Basically reaching a point where getting upright was more beneficial than the increasing length of time needed to gain safe access to the canopy.
• The sort of thing you still see in humans today i.e. potentially still fairly arboreal yet as infants not strong/dextrous or balanced until well past the age they are able to struggle upright.

These pressures may have emerged quite early in hominid evolution in different combinations with different results. If efficient bipedalism was a result it also provided a means of surviving outside the bio-chemical environment driving the whole process. In this theory some form of effective bipedalism would be an ideal candidate and necessary precursor to facilitate the unique pressures that came with a rapid and vast increase in brain size and associated juvenility/helplessness etc in humans, Neanderthals and their immediate ancestors.

However, the expanding formula also requires continued stable integration with forest ecology/bio-chemistry. Any move away from this will halt the run away neural expansion though increasingly large brained bipedal outcasts would have ever-greater survival capacity.