Those ground contacts create mechanical stretches on our muscles and tendons that, recorded by special "stretch sensors", become the signals that our brain, automatically and instantenously recognize and processes to maintain a safe body posture at all times. Those stretch signals are transmitted upward in the spinal cord ascending pathways- the largest&longest of all body sensory tracks- to reach the brain central sensory strip, laying conveniently adjacent to the command motor strip at the brain cortex.
With these close sensory and motor connections, body position, including upright posture is continuously corrected by our brain based on the information provided from legs as well as from the arms muscles when they are in contact with the ground. For illustration of this Ascending Nerve Pathway click on the following link http://www.wileyessential.com/neuroanatomy/flashcards/c11_1/c11_1.html
This is proprioception, the brain perception of our body posture that leads to automatic corrections to best posture at all times, but critically if we lose balance and risk a fall. Further, its performance does not require our awareness, it goes better and faster when out of the conscious level. The benefit of this instantaneous "unconscious" repositioning while using a "third leg", exceed any weight bearing benefits that the staff would also provide.
The third leg advantage of our Neurostaff, is the essential walking benefit in all neurological conditions with impaired balance as those deficits compensated by increased posture information form a "third leg staff". This benefit is applicable to all neuropathies, spinal stenosis, brain conditions like Parkinson, MS, stroke, gait ataxias etc, and, above all, as fall prevention for seniors. While these neurological conditions may impair balance in different ways, the added position sense information from a third leg helps the brain compensate for the handicaps