Comparison Process: Explananda, Pt. 3
As a demonstration of the creativity of the COMP, consider how the brain is organized. The real point is why the motor/sensory system is upside down and reversed left for right? That is the toes/feet/legs are on the superior part of the prefontal gyrus of the motor strip, as are the sensory areas, and the face and up is on the inferior part of the Premotor area. This is really simple to answer creatively using the comparison process. When we look through a magnifying glass held at a distance, what happens to the image? It’s reversed left for right and upside down. Is there a lens in the body? Sure, 1 concave lens in each eye which does this image transform as the magnifying glass. And so the left brain controls the right body and vice versa.
Further, in the brainstem decussation of the pyramids, sensory/motor afferents/efferents take the left brain connections to the right body and vice versa for the right brain connections.
So, it’s pretty clear to figure that our entire brain is organized according to our visual systems. To confirm this note that the visual cortex is also organized this same way. The inferior(lower) visual cortex receives input from the top 1/2 of the visual field of the contralateral eye. The superior part of the visual cortex receives input from the inferior (lower) 1/2 of the visual field in each eye. And of course the left vertical halves of the visual fields in both eyes go to the right visual cortex, and the same vice versa for the right halves.
This confirms that the brain is upside down and reversed right for left due to the lens images in the eyes. Our brains are organized around vision. We are visual creatures. And the same is true for the advanced apes, and probably even most mammals including dolphins. Just look for the Decussation of the pyramids in the brainstem of these mammals to confirm.
The superior parts of the brain’s motor/sensory strips are concerned with sensory/motor functions of the lower parts of the body, and the inf. body parts with the sup. parts of the brain.
The right parietal cortex on both sides is higher cognitive functions, being spatial relationships, and emotions(the cussing center is there) and the Left parietal with verbal reasoning, and so forth, right next to Wernicke’s area in the Left superior temporal lobe. As far as the Top/bottom approach to understanding the brain, the clinical aspects of brain lesions far outweigh any concern for that, surely.